Android
Available- Requires
- Android 7.0 or later, phone or tablet
- Get it from
- Google Play, Amazon Appstore
Offline maps for the field
Maps that work without a signal.
Topographic maps, GPS navigation, 3D terrain and team tools. Save an area before you leave and it all keeps working on the device, with no signal. On Android and the web.
- Works offline
- Maps, terrain and tools
- Coordinates
- MGRS, UTM, lat/long
- Works with
- TAK, MAVLink, GPX, KML
- Runs on
- Android, web
2D or 3D
Switch between 3D terrain and a flat map.
One tap moves between 3D terrain and a flat 2D map. Contours, the MGRS grid and your markers stay in place, and the flat view prints at true scale.
Layers
Every layer lives on your device.
Basemaps, terrain, contours, routes, your markers and your team's positions are all stored on the device. A connection adds live updates when you have one, and nothing stops when you don't.
Lat/long46.85291°, -121.76038° MGRS10T ES 94815 89385 Elevation4,392 m / 14,410 ft Slope8°
Rendered live from USGS 3DEP elevation, USGS aerial imagery and OpenStreetMap contributors
Works offline
Made for places without a signal.
Most map apps expect a connection and stop being useful without one. ZYRNTOPO keeps the maps, terrain and tools you need on the device itself.
When you do have a connection, it's used to sync, to download more maps and to connect to other tools. You never need one to navigate.
How offline works- 1Prepare
Choose the area, zoom range and layers on any device.
- 2Download
Tiles and terrain for the area come down once.
- 3Store
Kept in persistent storage the system will not reclaim.
- 4Disconnect
No signal and no server, and the map still works.
- 5Navigate
GPS position, routes, bearings and MGRS on the device.
- 6Record
Tracks, markers, photos and notes are saved locally.
- 7Analyze
Slope, viewshed and profiles are computed on the device.
- 8Sync
When a link returns, changes go out and come in.
Features
What you can do with it.
Everything here ships today on the devices listed with it. The first four run live in your browser, on the same Mount Rainier data as the map above.
Offline maps
Pick an area, download its maps and terrain, then navigate it with no connection.
Download selected area
Drag the box or pull its corners to frame the area, then choose zoom and download.
The same tool on Android
- 16 base maps, including USGS topo and aerial imagery
- Download an area with a zoom range, tile count and size estimate
- Saved maps are kept in storage the system won't clear
- GPS position, tracks, routes, waypoints, bearing and distance
- MGRS, UTM and latitude/longitude on every screen
Ships onAndroid Web
Terrain
See what is visible from a point, which slopes are steep and how a route climbs, all on the device. Try it on the south side of Mount Rainier.
- 3D terrain, with terrain saved for offline use
- Slope shading for avalanche terrain, plus aspect and hillshade
- What's visible from any point, and radio line of sight
- Elevation profiles with distance, gain and loss
Ships onAndroid Web
Mark and measure
Drop markers, draw lines and areas, and measure distances. Everything you add keeps its position, elevation and time, and exports to common file formats.
- Lines, areas, markers and freehand drawing
- The same marker symbols on every device
- Photo waypoints with position and bearing
- True-scale PDF maps to print for your pack
Ships onAndroid Web
Teams
Share positions, markers, tracks and chat over the internet, a local network, a mesh radio or a TAK server you run yourself.
- Team Sync: shared live map, chat and invites Pro
- Nearby TAK devices join automatically on the local network Pro
- Meshtastic radios bridge into Team Sync Pro
- Connect to a ZYRNTOPO TAK server you run yourself Pro
- Your own markers and tracks sync between your signed-in devices
Ships onAndroid Web
Formats and links
Bring data in and send it out in the formats other tools use, add your own map services, and connect live to TAK and MAVLink.
| Format or protocol | Import | Export | Live |
|---|---|---|---|
| GPXTracks, routes, waypoints | – | ||
| KML and KMZPlacemarks, lines, polygons | – | ||
| GeoJSONFeatures with properties | – | ||
| CSVPoints with coordinates | – | ||
| PDF map sheetTrue scale, with grid | – | – | |
| WMS, WMTS, WFSYour own map services | – | ||
| Cursor on TargetATAK, WinTAK, TAK servers | – | – | Pro |
| MAVLinkDrone position and status, UDP and serial | – | – | Pro |
| MeshtasticPositions and chat over LoRa | – | – | Pro |
- GPX, KML, GeoJSON and CSV in and out on every device
- Your own WMS, WMTS and WFS map services, free
- Live links to ATAK and TAK servers
- MAVLink drones and vehicles show up on your map
Ships onAndroid Web
Desktop
ZYRN Workstation puts the same maps and tools on a full desktop screen, with 3D terrain, a toolbar ribbon and a live status bar.
A ribbon of tabs grouped by task: Map, GPS and Team, Draw, Range and Bearing, Search and Rescue, Analysis, Data and View.
One click between the 2D map and 3D terrain, on the same data.
3D terrain and imagery with labeled peaks, falls and shelters.
A status bar with live coordinates, UTM and MGRS, imagery source, range and GPS status.
- 3D terrain and globe view
- Toolbars for search and rescue, range and bearing, and terrain
- Import, export and print from the desk
- Drone tool (MAVLink) with in-app video Pro
Ships onWindows Linux
Search and rescue
Search teams need more than a dot on a map.
Plan the search area, assign segments to teams for each shift, follow every team, log clues and export the record, on devices that keep working out of radio and cell range.
More on search and rescueIllustrative exercise on the Muir Snowfield, Mount Rainier. Not incident data.
Products
Apps for the field and the desk.
A field app for every device you carry, a 3D desktop app, and the services that link them. One account and one Pro license cover all of it.
- ZYRNTOPO The field app for Android and the web. Free, with Pro for teams.
- ZYRN Workstation The 3D desktop app for Windows and Linux, on the same account and data.
- Pro Team Sync, the TAK and MAVLink bridges and the power lines overlay, on every device.
- TAK server Run your own ZYRNTOPO TAK server, on hardware you control.
Platforms
One application on every device you carry.
The same maps and tools on phones, tablets and in the browser, with ZYRN Workstation on the desk. Data you prepare on one device moves to the next in open formats.
Full system requirementsWeb
Available- Requires
- Any current browser with WebGL2
- Install
- Runs at app.zyrntopo.com, installs as an app
Windows
Available- App
- ZYRN Workstation, the desktop app
- Requires
- Windows 10 or 11, OpenGL 4.1
- Install
- One PowerShell command, no administrator prompt
Linux
Available- App
- ZYRN Workstation, the desktop app
- Requires
- x86_64, glibc 2.35 or newer, OpenGL 4.1
- Install
- One terminal command, checked against SHA-256
iOS is planned and not yet available. Fire tablets install ZYRNTOPO from the Amazon Appstore.
Pricing
Free to use. Pro for teams.
Every mapping, navigation and terrain feature is free. Pro adds Team Sync, the TAK and MAVLink bridges and the power lines overlay. No seat counts and nothing to renew if you buy it once.
Free
$0
On every platform, no account required
- Offline maps and 16 base layers
- GPS, tracks and navigation
- Draw, measure and markers
- 3D terrain, viewshed and PDF map sheets
- Unlimited offline downloads
- GPX, GeoJSON, KML and CSV
Pro
$79.99 once
or $2.99 a month, cancel any time
- Team Sync: a shared live map with chat
- ATAK, TAK server and MAVLink bridges
- Nearby TAK devices on the local network
- The power lines overlay
- One license on all four platforms
Buy once and it never expires. 14-day refund.
Company
Clear about what the software does.
ZYRNTOPO and ZYRN Workstation are designed and built in Washington State by Grange Dev Group. We list what ships and say plainly where your data goes.
About the company- Privacy
- No advertising and no third-party trackers. Map data stays on the device unless you choose to sync it. Privacy policy
- Data sources
- Built on public and open data from USGS, NOAA, OpenStreetMap and others, credited in the app and on every view here. Sources and licenses
- Support
- Technical support, bug reports, security reports and organizational inquiries reach the people who build the software. Support paths
- Security
- Navigation needs no server. What does leave the device, and how to report a security problem, is written down. Security
Save your maps before you lose signal.
Free on every platform, with no account needed to start.