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Tactical Navigation & Mapping PWA

Navigate When Infrastructure Fails

Name: GridDown Maps
Brand: BlackAtlas
Price: 600 USD
Availability: InStock

GridDown is a Progressive Web App for tactical navigation, team coordination, and situational awareness that works completely offline. GPS-denied navigation, celestial positioning, mesh radio integration, and sensor fusion for when you can't rely on cellular or satellite infrastructure.

Request More Information → View Capabilities

100%

Offline Capable

GPS-Free

Navigation

$600

Per Seat, Perpetual

CoT

Compatible

Explore

GridDown — Tactical Navigation Demo

Infrastructure-Independent by Design

GridDown operates entirely on your device without requiring cellular, WiFi, or satellite connectivity. Download offline maps, cache weather data, and coordinate with your team via mesh radio—all without touching the cloud. Your position data stays on your device unless you explicitly choose to share it.

Interface

What It Looks Like in the Field

Real screens from a running instance, on an exercise scenario. Everything here works with the network off — the map tiles, the terrain data, and the analysis all run on the device.

GridDown Maps showing a topographic basemap with contour lines, an operational route between named waypoints, team member markers, a hazard zone, and a map-layers panel listing OpenStreetMap, OpenTopoMap, USGS and BLM sources plus MGRS grid, slope and cold-region overlays. — **Your basemap, your overlays, cached on the device.** Topographic contours with an operational route, named waypoints, team positions, and a marked hazard laid over it. The layer panel is the part that matters for austere work: OpenStreetMap, OpenTopoMap, USGS and BLM sources, with MGRS military grid, slope steepness for trafficability and avalanche assessment, and cold-region terrain packs as overlays. Tiles are cached locally — the map does not stop working when the connection does.

GridDown Maps GPS panel with Fused Navigation switched on, listing six independent fix sources — GNSS, resection, VTR skyline, celestial, inertial and dead reckoning — each with its current state, plus a manual position entry option. — **Six ways to know where you are, and one honest answer.** GNSS is one input, not the only one. Terrain resection, skyline matching, celestial sighting, inertial prediction, and dead reckoning are all first-class fix sources, and the panel shows the live state of each. Here GPS is not tracking at all — which is exactly the condition the product is built for, and why manual position entry accepts decimal, DMS, UTM, and MGRS.

GridDown Maps RF line-of-sight coverage map showing a radial propagation bloom around a transmitter on the map, with a panel listing transmitter position, antenna height, radius, frequency band, rain rate and coverage results broken into clear, marginal and blocked samples. — **Will the radio actually reach?** Pick a transmitter position and antenna height, set the band and the weather, and GridDown models coverage radially against terrain — then tells you plainly what it found. Here 21% coverage over a 5 km radius: 127 clear samples against 485 blocked. It also states its own limits, noting that vegetation is not modelled, which is the difference between a planning tool and a sales demo.

GridDown Maps terrain analysis panel showing a limited-visibility warning with hidden point count, a solar exposure score with estimated sun hours and best aspect, a flood risk assessment with score and runoff risk factor, and a cover and concealment rating with terrain masking, defilade type and a coverage-by-direction rose. — **Terrain analysis that answers operational questions.** For any point: how much of the surrounding ground you can actually see and how many points are hidden from you; solar exposure with sun hours and best-facing aspect; flood risk with the specific factors driving it; and cover and concealment with terrain masking, defilade type, and a rose showing which directions are covered and which leave you exposed. Assessments, not raw elevation numbers.

GridDown Maps Visual Terrain Referencing panel with a status readout for prior position, captured skyline and elevation grid, a step to set the prior position from dead reckoning or GPS with an uncertainty radius, and a step to capture horizon points by camera or device orientation. — **Position from the horizon, with no satellites.** Give it a rough prior and an uncertainty radius, then capture azimuth and elevation points along the visible skyline — by camera, by device orientation, or by hand. GridDown matches that profile against elevation data to fix your position. The panel is written as a procedure, with the trade-off stated where you need it: a larger search radius covers more ground but takes longer.

GridDown Maps Team and Comms panel on the Radio Links tab, showing mesh device selection across several supported radios, Bluetooth, serial and network connection options, a node identity field, and scenario presets including search and rescue, field exercise and emergency. — **Off-grid comms, paired from the same app.** Connect a mesh radio over Bluetooth, serial, or the local network — a range of common devices is supported, and the panel tells you which transports each one accepts rather than making you find out. Set your node identity, pick a scenario preset for search and rescue, a field exercise, or an emergency, and team positions and messages land on the same map as everything else.

Screens show an exercise scenario with synthetic callsigns and waypoints in public wilderness. Counters read zero where no live sensor or radio was attached.

Core Capabilities

What's Included

From basic navigation to advanced sensor integration, GridDown provides comprehensive tools for operating when infrastructure is unavailable or untrusted.

Search capabilities

NAV

Core

Navigation

Multi-source positioning

Standard GPS with automatic fallback to inertial navigation and pedestrian dead reckoning. Barometric altimeter, magnetic compass, and route planning with terrain analysis. Works indoors, underground, and in GPS-denied environments.

GPS + INS Dead Reckoning Route Planning Elevation Profile

CEL

Core

Celestial Navigation

Ancient methods, modern precision

Determine your position using sun, moon, and stars when GPS is unavailable or compromised. Camera-based sextant for altitude measurements, automatic sight reduction, and position fixing. No satellites required—just clear sky.

Sun/Moon/Stars Camera Sextant LOP Calculation Almanac Data

TEAM

Core

Team Coordination

Mesh-networked SA

Share positions and status with your team over Meshtastic mesh radio—no cellular required. View team members on the map, send waypoints, and coordinate movements. Full Cursor on Target interoperability via CoT Bridge for mixed-capability teams.

Meshtastic APRS CoT Bridge PLI Sharing

SDR

Integration

RF Situational Awareness

Aircraft, ships & drones via SDR

Pair with an AtlasRF SDR feed or the GridDown Sensor Hub to plot ADS-B aircraft, AIS vessels, Remote ID and FPV drones, weather radiosondes, and APRS stations on the live map. Decode FIS-B (978 MHz) weather off-grid, and surface emergency squawks (7500/7600/7700) and maritime SART/EPIRB alerts automatically.

ADS-B / AIS Drone Remote ID FIS-B Weather Squawk Alerts

Core

Weather Intelligence

Multi-source forecasting

Cache NWS and IEM weather data before going offline, or receive real-time weather via AtlasRF's FIS-B decoder (978 MHz). View radar, forecasts, and alerts without internet, layer NASA satellite imagery and EPA AirNow air-quality data, and pull sun/moon times and magnetic declination for any point. Barometric pressure tracking for local weather prediction.

NWS/IEM Cache FIS-B Weather Radar Imagery Pressure Trend

SOS

Core

Emergency Tools

Critical situation support

SOS beacon generator, signal-mirror sun-angle calculator, distress-signal reference, and contingency planning. Pre-plan evacuation routes and cache emergency contact cards. With the Sensor Hub's integrated 406 MHz SARSAT receiver, detect emergency beacons (ELT/PLB/EPIRB) and plot decoded positions on the map with approach/recede trend analysis.

SOS Generator Signal Mirror Evac Planning Beacon Detect

COMM

Core

Communications

Radio frequency planning

Generate comprehensive communication plans with frequency allocations, call signs, and schedules. RF line-of-sight analysis using terrain data. Repeater database and coverage mapping. SSTV image encoding/decoding for radio image transmission.

Comm Plans RF LOS Analysis SSTV TX/RX Repeater DB

MESH

Core

Bring Your Own Radio

Any Meshtastic-compatible node, three ways to connect

There is no approved-hardware list to buy into. GridDown pairs with any Meshtastic-compatible radio, and what differs between devices is how they connect — which is what actually decides how you can deploy one:

Bluetooth — pair and go, nothing to plug in. Every supported radio does at least this.
Bluetooth or USB serial — adds a wired path for when the 2.4 GHz band is congested or restricted.
Bluetooth, serial, or local network — adds network pairing, which is what makes a fixed base-station install work.

Presets cover the common boards so you tap once and connect; anything else pairs through the generic option. Pairing hardware needs Chrome or Edge — Apple’s browser engine does not expose Bluetooth or serial to web apps on iOS.

Meshtastic-Compatible BLE USB Serial Network No Vendor Lock

MAP

Core

Offline Maps

Pre-cached cartography

Download and cache map tiles from OpenStreetMap, OpenTopoMap, USGS, and satellite imagery for offline use. Import GPX tracks and KML overlays. Drop pins, create routes, and annotate the map—all stored locally in your browser.

OSM/OTM USGS Topo Satellite GPX/KML

H₂O

Core

Water Quality

Field microbiology analysis

Connect a Fluidion ALERT One analyzer via USB to test water for E. coli, Total Coliform, and Enterococci. Results interpreted against WHO, EPA, and EU standards with treatment recommendations and use advisories. Manual entry and file import for field teams without hardware.

Fluidion ALERT One WHO/EPA/EU Standards Treatment Advisories Map Overlay

Core

AR Overlay

Camera heads-up display

Augmented reality display overlays waypoints, landmarks, team positions, and navigation bearings directly on your camera view. Point your device and see what's at each bearing without switching to the map.

Camera HUD Waypoint Overlay Bearing Display POI Labels

REF

Core

Field Guides

Offline survival reference

Comprehensive offline reference database covering wilderness survival, foraging, shelter construction, water purification, knot tying, and first aid. Available without network connectivity.

Survival Skills Foraging ID First Aid Offline DB

COMM

Core

Communication Plans

Radio frequency management

Manage radio frequencies, call signs, check-in schedules, and emergency protocols for your team. Pre-build communication plans for operations and share them via QR code or mesh.

Freq Management Call Signs Check-In Schedule QR Sharing

EXP

Core

Exposure Tracking

Personal risk modeling

Tracks personal exposure risk based on temperature, wind chill, heat index, activity level, and elapsed time. Models hypothermia, heat stroke, and dehydration risk with alerts before conditions become dangerous.

Hypothermia Risk Heat Index Wind Chill Time Tracking

Core

RF Line-of-Sight

Radio propagation analysis

Analyze radio propagation paths between any two points using terrain elevation data. Visualize Fresnel zone clearance, path loss, and obstruction profiles—now factoring in man-made obstacles imported from the FAA Digital Obstacle File (and your own placed obstacles) with multi-obstacle diffraction modeling—for planning radio relay positions.

Fresnel Zone Path Loss FAA Obstacles Relay Planning

SSTV

Core

SSTV Image Transfer

Slow-scan television over radio

Encode and decode Slow Scan Television images for transmission over amateur radio. Send photos, maps, and situational reports via HF/VHF radio when no data network is available.

Encode Decode Multiple Modes HF/VHF

VID

Core

External Video Feed

See what a teammate sees, over local RF — no internet

Display a live feed from a wireless video receiver — CineView, Walksnail, HDZero, or analogue 5.8 GHz — captured over HDMI by any USB UVC capture device. Selectable at 480p, 720p, or 1080p, at 30 fps, shown picture-in-picture beside the map and off by default. The link is local RF, so it needs no internet and no infrastructure: the picture drops when line of sight breaks at 5–6 GHz while voice and text carry on over the LoRa mesh. Unplugging the capture device ends the feed rather than freezing on a stale frame that would still look live.

480p / 720p / 1080p 30 fps USB UVC Capture Picture-in-Picture No Internet

PACK

Core

Cold-Region Layer Packs

Pre-built terrain and feature layers for austere northern ground

Load pre-built layer packs covering cold-region terrain and features, then render them as a gridded overlay that rotates with the map. Reprojection and tiling happen before the pack ever reaches the tablet, so a device in the field only parses, stores, and draws. Class-coded layers are drawn without smoothing on purpose — interpolating between two nominal class codes would invent a class that does not exist. Packs are stored separately from terrain-hazard data and namespaced per pack, so two packs covering the same ground cannot collide.

Offline Packs Rotating Overlay Class-Coded No Interpolation

LAT

Core

High-Latitude PNT Policy

The compass fails before the latitude looks extreme

At high latitude a magnetic compass degrades and eventually becomes useless — but the threshold is not a line of latitude, because the magnetic pole is offset from the geographic pole and drifts. GridDown keys the decision on measured horizontal field intensity instead, inflating the compass’s assumed error through a caution band and dropping it entirely in a blackout band rather than letting a confident-but-wrong heading into the fusion. Celestial witnesses are scheduled on solar altitude, including polar day. Web Mercator is also undefined at the poles, so the projection is clamped to its valid band and the view is flagged when a true polar render mode would be required.

Field-Intensity Keyed Witness Admission Polar Day Projection Guard

SAT

Core

Satellite Weather Imagery

GOES and NASA imagery, cached for offline use

Pull weather satellite imagery — true colour, infrared, water vapour, and more — in regional or full-disk views, with animation across recent frames. Imagery is cached locally so the last download stays available after the connection does not. All of it is US Government public-domain imagery requiring no API key and no account.

GOES & NASA Multiple Products Animation Offline Cached

ALGN

Core

Radar Alignment Verification

Prove an external sensor is pointing where it thinks

A survey-style workflow for checking any directional sensor that reports bearing and range. Pick known landmarks, and GridDown computes true bearing and range from the sensor’s surveyed position; enter what the sensor reported for the same landmarks and it returns per-landmark discrepancies plus a multi-landmark consistency analysis that separates a constant mounting offset from scatter. Even self-aligning radars can be installed with the antenna baseline off-axis, and nothing downstream can detect it — every track is simply rotated.

Landmark Survey Per-Point Error Offset vs Scatter Any Directional Sensor

HUB

Core

Relay Hub

Turn one instance into a command-post relay

Designate a GridDown instance as a hub and it relays messages between team members who cannot hear each other directly, bridges radio traffic to and from an internet link when one exists, holds messages for recipients who are offline and delivers them on reconnect, tracks delivery confirmations, and pushes encrypted position updates to the team. Deliberately hub-and-spoke rather than mesh flooding — deterministic and debuggable, so you can say why a message did or did not arrive.

Out-of-Range Relay Radio ↔ Internet Store & Forward Delivery ACKs

MESH

Core

Mesh Topology & Peers

See the network, not just the nodes

Draw the relay network on the map as link lines coloured by signal quality, labelled with signal strength, noise margin, and hop count as you zoom in. Behind it, one de-duplicated peer list merges team members, mesh radio nodes, and Secure Messenger peers keyed by callsign, each carrying which systems it is reachable through — so a callsign shows every path to that person rather than appearing three times in three lists.

Link Quality Lines RSSI / SNR / Hops Unified Peers Multi-Path Reachability

FIX

Core

Unified Position Fixes

Every fix carries a defensible uncertainty

GridDown derives position from several independent methods — internal GPS, an external receiver, terrain resection with a rangefinder, visual terrain referencing, celestial running fixes, and pedestrian dead reckoning. All of them are normalised into one fix representation carrying real positional uncertainty, so the map can draw an error ellipse for any source rather than only for GPS. You can see how well the system actually knows where you are, and which method is telling you.

One Fix Contract Covariance Error Ellipse Any Source

LOG

Core

Logistics Planning

Route & resource analysis

Calculate fuel, water, and food requirements for any route based on distance, elevation, vehicle type, and team size. Identifies critical resupply points and calculates turnaround limits.

Fuel Calc Water/Food Resupply Points Turnaround

NVG

Core

Night & Stealth Modes

Light discipline

Red-light night vision mode preserves dark adaptation. Ultra-dim stealth mode minimizes light signature for operations requiring strict light discipline. Switchable with one tap.

Red Light Stealth Mode One-Tap Switch NVG Compatible

HNT

Core

Hunting

Wind-driven scent cone modeling

Real-time scent dispersion cone on the map driven by live wind data. Solunar forecasting with major/minor period predictions. Movement scoring, stand manager with wind ranking, sighting logger with pattern analysis, thermal modeling, and terrain-aware funnel detection.

Scent Cone Solunar Forecast Stand Manager Sighting Heatmap

FSH

Core

Fishing

Solunar predictions & spot management

Shared solunar prediction engine tuned for fishing activity windows. Spot manager with species profiles, catch logging, and conditions tracking. Pressure trend analysis for bite prediction.

Solunar Engine Spot Manager Catch Log Pressure Trends

⚡

Core

Lightning Safety

Strike risk & approach timing

Assesses lightning risk based on atmospheric conditions and storm proximity. Calculates flash-to-bang distance, approach/retreat timing, and recommended shelter actions. Integrates with weather alerts for proactive warnings.

Flash-to-Bang Risk Assessment Storm Tracking Shelter Alerts

WTR

Core

Water Crossing

Ford/swim risk assessment

Evaluates water crossing safety based on depth, current speed, and team capability. Integrates with USGS stream gauge data for real-time flow conditions. Risk scoring with go/no-go recommendations.

Risk Scoring Stream Gauge Flow Conditions Go/No-Go

DRN

Integration

WiFi Sentinel

Passive drone detection via WiFi

Detects consumer drones by identifying characteristic WiFi probe patterns and OUIs from DJI, Skydio, Autel, and other manufacturers. Dual-tier architecture: software scan on the tablet or dedicated ESP32 hardware sensor for continuous monitoring.

DJI Detection Skydio Detection ESP32 Sensor Passive/Covert

NET

Integration

Connectivity Monitor

Cellular, WiFi & Starlink status

Real-time monitoring of all network links via AtlasRF integration. Cellular tower details with RSRP/RSRQ/SINR and neighbor cells, WiFi link quality, and Starlink terminal health with throughput and obstruction metrics. Automatic failover detection.

Cell Tower Info WiFi Health Starlink Status Failover Detection

VTR

Experimental

Visual Terrain Referencing

Match the skyline to fix your position

When GPS is denied, VTR estimates where you are by matching the horizon you can see against terrain elevation data. Capture the skyline three ways—through the camera, by aiming the device (orientation), or from a named landmark—then compute a fix around a rough prior position. Best with a clear view of distinctive terrain. It is experimental and uncalibrated: it reports a confidence score with deliberately conservative uncertainty and is pending field validation, so always cross-check it against another source.

Skyline Match Camera / Orientation Prior + Search Radius GPS-Denied

FUSE

Core

Fused Navigation

One estimate from every sensor

A Kalman filter fuses GPS, rangefinder resection, VTR skyline match, and celestial fixes—using pedestrian dead reckoning as the motion model between them—into a single position with a 95% error ellipse and a plain-language accuracy readout (e.g. "±42 m 95%, resection, GDOP 2.1"). Innovation gating automatically rejects a GPS fix that jumps from spoofing, multipath, or a bad lock, and an integrity layer warns you when GPS quality collapses or it's likely being jammed. Ingesting spoof/jam flags from an external u-blox receiver is a planned enhancement.

Kalman Fusion Error Ellipse Spoof/Jump Rejection Integrity Alerts

FIRE

Core

Wildfire & Thermal

Fire perimeters & satellite hot pixels

Overlay confirmed NIFC wildfire perimeters, unconfirmed satellite hot-pixel detections from NASA FIRMS and NOAA GOES, and GOES infrared cloud-top and fire-band imagery. Builds a full fire-awareness picture—agency perimeters plus near-real-time thermal signatures—for evacuation and route planning.

NIFC Perimeters FIRMS Hot Pixels GOES IR Evac Planning

FIND

Core

Rapid Access

Find any feature under stress

Unified global search (Ctrl+K) across actions, waypoints, routes, team, settings, 3,100+ named landmarks, and offline place packs. The Situation Wizard (F1) guides you to the right tool under stress, and a long-press "What's Here" readout aggregates coordinates, elevation, slope, sun/moon, declination, weather, and nearby features for any point.

Global Search Situation Wizard "What's Here" Offline Places

RAD

Integration

Radiation Detection

Gamma spectrometry & dose mapping

Connect a RadiaCode 101/102/103/110 gamma spectrometer over Web Bluetooth for live dose rate (μSv/h) and count rate with color-coded threshold alerts. View the 1024-channel spectrum with peak detection and identification of 14 common isotopes, and record GPS-tagged radiation tracks that overlay on the map. A demo mode exercises every feature without hardware.

Dose Rate 1024-ch Spectrum Isotope ID Dose Mapping

MED

Core

Medical Reference

Offline field medicine

An offline library of 50+ treatment protocols spanning trauma, medical, environmental, and toxicology emergencies, with step-by-step procedures and warnings. Quick-reference tables (vitals by age, CPR, Rule of 9s, Glasgow Coma Scale) and a field-medication database round it out. A reference aid—not a substitute for training or professional care.

50+ Protocols Drug Database Quick Tables Fully Offline

DOC

Core

Plans & Export

Paper backup & data exchange

Print or export a complete operational plan—route cards, waypoint lists, and comm plans—so you have a paper backup when the electronics fail. Import and export GPX, KML/KMZ, and GeoJSON, and share an entire plan as a .gdplan package between team members. Plan packages are plaintext — send them over a link that encrypts if the contents are sensitive.

Print / PDF GPX / KML GeoJSON .gdplan packages

WPT

Core

Waypoints & Coordinates

Structured marks, every grid

Drop seven structured waypoint types—water, fuel, camp, resupply, hazard, bail-out, and custom—with type-specific fields, photos, notes, and verification timestamps. Read and enter positions in DD, DMS, DDM, UTM, or MGRS, and measure distance, area, and bearing directly on the map.

7 Waypoint Types MGRS / UTM Measure Tools Filter & Search

TER

Core

Terrain Analysis

Read the ground before you move

Compute slope and aspect with trafficability and avalanche shading, run viewshed analysis to find or avoid observation posts, score cover and concealment, rate solar exposure for campsite selection, and flag flood risk—all derived from elevation data and overlaid on the map.

Slope / Aspect Viewshed Cover & Concealment Flood Risk

ZONE

Core

Geofence Zones

Draw the AO, get alerted

Draw operational zones and geofences on the map and get automatic entry, exit, and dwell alerts as you or your team cross them. Zones sync across the mesh for shared awareness, import from KML/KMZ, and cross-reference AtlasRF ground-sensor triggers—so a tripped perimeter sensor names the zone it fired in—and display KrakenSDR direction-finding bearings.

Entry/Exit/Dwell Team Sync Sensor Triggers KML Import

DASH

Core

Status Dashboard

Whole mission at a glance

A single sit-rep screen that aggregates live status from every subsystem—GPS and fused-fix quality, network and storage, connected radios and sensors (mesh, messenger, SARSAT, AtlasRF, Sensor Hub), team health, and active SOS and zone alerts—so an operator or a briefer can confirm everything is healthy without clicking through twenty panels.

Subsystem Health Fix Quality Radios & Sensors One Glance

HIKE

Core

Hiking & Pace

Time, daylight & turnaround

Estimate travel time for a route from your pace and the terrain (Naismith-style, with presets from heavy-pack to trail-runner), track remaining daylight against your plan, and get turnaround alerts so you aren't caught out after dark.

Pace Presets Time Estimate Daylight Tracking Turnaround Alert

RSXN

Core

Rangefinder Resection

Fix your position from landmarks

Fix your position without GPS by measuring distances to known landmarks with any rangefinder—laser, optical, or estimated—and entering them manually. GridDown trilaterates your location from the bundled 3,100+ landmark database and feeds the result, with its uncertainty, into the fused estimate.

Trilateration Any Rangefinder Landmark DB GPS-Denied

Technical Advantages

Technical Architecture

Every feature is designed to work when traditional infrastructure is unavailable, compromised, or simply out of range.

100% Offline

Service worker caches the entire app. Pre-download maps and weather. Zero network dependency once cached.

GPS-Denied Ready

Inertial navigation, dead reckoning, and celestial positioning when GPS is jammed, spoofed, or unavailable.

Privacy First

All data stays on your device. No telemetry, no cloud sync, no accounts required. Position sharing is opt-in only.

Cross-Platform

Delivered as a Progressive Web App at app.blackatlas.tech—sign in after purchase, install it to your home screen, and it runs like a native app from then on. Maps, navigation, terrain analysis, and planning run on iOS, Android, Windows, Mac, and Linux. Pairing hardware over Bluetooth or USB—mesh radios, an external GPS, a gamma spectrometer—needs Chrome or Edge, since Apple’s browser engine does not expose those APIs on iOS.

CoT Interoperable

CoT Bridge enables bidirectional Cursor on Target communication for mixed-capability team operations.

Mesh Networked

Native Meshtastic and APRS integration for off-grid team coordination over license-free mesh radio.

Low Power

Efficient rendering and optional sensor polling. Night mode and battery-conscious design for extended field use.

Accessible

Full keyboard navigation, screen reader support, and ARIA compliance. Usable by everyone, in any situation.

GridDown running on Samsung Galaxy Tab Active5 Pro — Field-ready hardware

Pre-Configured Hardware

Ready-to-Deploy Devices

Don't want to build your own? Order a pre-configured GridDown hardware device — arrives ready to deploy with offline maps pre-loaded. Just power on.

Why Buy a Pre-Configured Device?

GridDown software on your own phone or tablet gets you a capable navigator. Our pre-configured devices take that further — running GridDown through Termux with full system-level access, so everything works the moment you power on, with none of the mobile OS friction.

✓ Always-on GPS and sensor logging — survives screen-off ✓ AtlasRF feeds pre-configured ✓ Auto-start on boot — power on, deploy ✓ Persistent Bluetooth — Meshtastic/RadiaCode stay connected ✓ Persistent USB serial — APRS TNC, Fluidion auto-reconnect ✓ Unlimited map storage — no browser quota limits ✓ Offline maps for your AO pre-loaded ✓ Remote management via SSH ✓ Scheduled updates and cache maintenance ✓ Rugged tablet tested for field use

GridDown Tablet

Samsung Galaxy Tab Active5 Pro

$1,500

Ships in 2–3 weeks

Samsung Galaxy Tab Active5 Pro (cellular)
GridDown Maps — all features included
On-The-Go (OTG) USB hub
SIM card
High-speed Ethernet cable
Rugged tablet case with kickstand
Rugged carrying case
BlackAtlas marketing materials

Order — $1,500

Situational Awareness

Sensor Hub

Passive multi-domain · Consumer & Pro

$2,500

Consumer · Pro $6,500 · ships 3–4 weeks

ADS-B (1090) & UAT (978) aircraft + FIS-B weather
AIS vessel tracking
Drone Remote ID detection (ASTM F3411)
406 MHz SARSAT beacons (ELT / PLB / EPIRB)
Onboard air, gas, lightning & UV monitoring
External instrument ingest (Modbus & HTTP)
Threshold alarms + downwind plume estimate
Passive receive-only · GridDown + TAK output

View Sensor Hub

GridDown Maps is licensed per seat — $600 per seat, perpetual for the version you buy, with twelve months of updates, data, and support included; $150 per seat per year after that keeps them coming. Hardware bundles add BlackAtlas ecosystem integration, Termux deployment, pre-loaded maps, and tested peripheral pairing. The GridDown Tablet is a commercially available Samsung device — BlackAtlas is not affiliated with, endorsed by, or in partnership with Samsung.

Applications

Who Uses GridDown

From search and rescue teams to prepared individuals, GridDown serves anyone who needs reliable navigation when infrastructure fails.

Search & Rescue

Coordinate ground teams in remote areas with no cell coverage. Track team positions via Meshtastic, share search grids, and integrate with SARSAT for beacon detection. CoT interoperability for multi-agency operations.

Fire & Emergency Services

Navigate through smoke and GPS-degraded conditions. Pre-cache maps of your jurisdiction, plan evacuation routes, and coordinate with incident command via CoT. Offline weather critical for fire weather monitoring.

Security Operations

Maintain situational awareness without depending on potentially compromised infrastructure. AtlasRF integration tracks nearby aircraft and drones. Discrete operation with no cloud telemetry.

Backcountry Recreation

Navigate trails, track elevation, and plan routes in areas without cellular coverage. Cache USGS topo maps before your trip. Share your position with family via Meshtastic relay points.

Emergency Preparedness

Pre-plan evacuation routes and cache maps of your area before disaster strikes. Medical reference database for first aid. SSTV capability for emergency communications when all else fails.

Field Research

Log waypoints and tracks in remote locations. RadiaCode integration for radiation surveys. Export data in standard formats. No cloud dependency means no data sovereignty concerns.

Hardware Ecosystem

Compatible Hardware

GridDown integrates with a growing ecosystem of affordable, off-the-shelf hardware via Bluetooth and Web Serial.

Mesh Radio

Meshtastic

BLE / USB Serial

Off-grid team position sharing
Text messaging over LoRa
Waypoint transmission
Telemetry & node info
Traceroute visualization

Radiation Detector

RadiaCode

Bluetooth LE

Real-time dose rate
Cumulative dose tracking
Gamma spectrum analysis
Isotope identification
Map overlay visualization

RF Monitoring

AtlasRF

WebSocket / REST

Aircraft tracking (ADS-B)
Ship tracking (AIS)
Drone detection (Remote ID)
FPV drone RF detection
Off-grid weather (FIS-B)

Amateur Radio

APRS TNC

USB Serial

Position beaconing
Station tracking
Message exchange
Weather station data
Digipeater integration

Air & Emergency Surveillance

Sensor Hub

Embedded Linux Module

ADS-B (1090 MHz) detection
UAT (978 MHz) detection
FAA Remote ID detection
406 MHz SARSAT beacon receiver (ELT/PLB/EPIRB)
Passive receive only
Plug-and-play WiFi to GridDown

CoT Gateway

CoT Bridge

Embedded Linux Platform

CoT device interop
Bidirectional CoT
Position sharing
CoT server support
WiFi configuration

Water Quality

Fluidion ALERT One

USB-C Serial

E. coli / Total Coliform
Enterococci detection
WHO/EPA/EU standards
Treatment advisories
Geotagged map overlay

Technical Specifications

GridDown is a pure client-side Progressive Web App with no server dependencies. All processing happens on your device, ensuring complete operational security and infrastructure independence.

Application Type Progressive Web App (PWA)

Frontend Stack Vanilla JS / HTML5 Canvas

Map Rendering Custom Canvas Renderer

Offline Storage IndexedDB / Service Worker

Hardware APIs Web Bluetooth / Web Serial

Sensor APIs Geolocation / DeviceMotion / DeviceOrientation

Map Sources OSM / OTM / USGS / Satellite

Data Formats GPX / KML / GeoJSON / CoT XML

License Per-seat perpetual, proprietary (not open source)

Current Version 7.6.173

Ready to navigate off-grid?

GridDown Maps comes pre-installed and pre-configured on BlackAtlas hardware — maps cached for your area of operations, peripherals paired and tested, ready to deploy out of the box.

Order — $600 / Seat Request More Information

Export control: GridDown Maps ECCN EAR99 — it performs no cryptography. Not ITAR.

$600 per seat, perpetual · Access at app.blackatlas.tech after purchase · Installable PWA & Android · 12 months of updates & support included · Pre-configured hardware ships in 2–3 weeks

Privacy by Design

✓ No accounts or registration required
✓ No analytics, telemetry, or tracking
✓ No cloud backend or data sync
✓ All data stored locally on your device
✓ Position sharing is opt-in only
✓ Clear your data anytime via browser settings

Security

✓ Offline-first minimizes attack surface
✓ No credentials to steal (no accounts)
✓ All external connections use HTTPS/TLS
✓ No telemetry, no cloud backend, no data sent to us
✓ No cryptography — nothing to key, nothing to lose
✓ Responsible disclosure program

Permissions

Location — Map centering, navigation
Microphone — SSTV receive only
Camera — SSTV transmit, celestial nav
Bluetooth — Meshtastic, RadiaCode
USB — Serial device connections

Data Source Attributions

GridDown integrates data from the following sources under their respective licenses.

Map Data

Weather & Environmental

Weather data by Open-Meteo.com (CC BY 4.0)
Iowa Environmental Mesonet / NOAA
EPA AirNow (Public Domain)
USGS Water Services (Public Domain)

Protocols & Integrations

APRS® is a registered trademark of TAPR
Meshtastic (GPL-3.0)
RadiaCode BLE protocol (MIT)
Search by Nominatim/OSM (ODbL)

View complete attributions and licensing details →

Important Legal Disclaimers

NOT FOR SAFETY-CRITICAL APPLICATIONS: GridDown is NOT designed or intended for use in any safety-critical application including aviation navigation, maritime navigation, emergency response coordination, or any application where failure could result in death, injury, or property damage. All navigation data is for INFORMATIONAL PURPOSES ONLY. Always carry backup navigation equipment and verify positions using multiple sources.

CELESTIAL NAVIGATION LIMITATIONS: Celestial navigation features are provided for educational and emergency backup purposes only. Accuracy depends on user skill, equipment calibration, atmospheric conditions, and proper technique. Do not rely solely on celestial navigation for critical position determination.

GPS-DENIED NAVIGATION: Inertial navigation and dead reckoning accumulate error over time. These features are intended as temporary supplements when GPS is unavailable, not as primary navigation methods. Accuracy degrades significantly with distance and time.

SENSOR INTEGRATION: RadiaCode radiation readings, AtlasRF detections, and other sensor data are for informational purposes only. Do not use for safety-critical radiation protection decisions or aircraft/drone avoidance. Professional equipment and training are required for such applications.

RADIO COMMUNICATIONS: APRS® is a registered trademark of the Tucson Amateur Packet Radio Corporation (TAPR). APRS was developed by Bob Bruninga, WB4APR (SK). APRS integration requires appropriate amateur radio licensing. Meshtastic operation must comply with ISM band regulations in your jurisdiction. Users are solely responsible for regulatory compliance.

TAK/COT NON-AFFILIATION: GridDown is NOT affiliated with, endorsed by, or sponsored by the TAK Product Center, the United States Government, the Department of Defense, or any military or government agency. "Cursor on Target" (CoT) is an open XML schema. TAK interoperability features are provided for convenience and do not imply any official relationship or certification.

THIRD-PARTY DATA & SERVICES: GridDown integrates data from third-party sources including OpenStreetMap, USGS, NOAA, NASA, Open-Meteo, and EPA AirNow. This data may be incomplete, inaccurate, or outdated. BlackAtlas is not responsible for third-party data quality. Always verify critical information through official sources.

WARRANTY: GridDown Maps is proprietary software provided "AS IS" without warranty of any kind. Third-party hardware components (Samsung tablets, Satechi hubs, RTL-SDR receivers) carry their original manufacturer's warranty. Pre-configured hardware sold by BlackAtlas is covered by a separate hardware sales agreement. See Terms of Service and Full Disclaimer for complete details.

Legal & Documentation

GridDown Terms & Policies

GridDown Maps is proprietary software supplied with BlackAtlas hardware (not open source). The documents below govern its use and explain how your data is handled.

License (EULA) Privacy Policy Terms of Service Disclaimer Security Policy