Offline first
A feature is not done until it works with no connection, or says clearly that it needs one.
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Company
Designed and built in Washington State.
ZYRNTOPO and ZYRN Workstation are made by Grange Dev Group in Washington State, where plenty of places still have no signal.
About
Map software that doesn't need a signal.
The map has to keep working when the phone has no bars. So the maps, terrain, tools and your own data live on the device, and the app uses a connection when there is one instead of waiting for it.
That led to a field app for Android and the web, ZYRN Workstation for the desk, and Team Sync, a self-hosted TAK server, local network discovery and mesh radio support to connect them. Everything exports to common file formats, so your data never gets stuck.
We build for search and rescue teams, field crews, emergency managers, drone operators and people heading into the backcountry.
Principles
How we decide what to build.
Open formats
Your data exports to common formats, and the app works with the tools teams already use.
Available or planned
Every feature and platform is marked available or planned, and only what has been tested is marked available.
Support
Where to go with a question.
Most fixes start with a report from someone in the field. The more detail you give, the faster we can fix it.
Documentation
Getting started, offline maps, terrain, Team Sync, TAK and import and export.
Read the documentationCommunity forum
Questions, field notes and feature requests, answered by the people who build the software.
Visit the forumBug reports
Tell us what you did, what you expected and what happened instead. Screenshots help.
Report a problemSecurity reports
Send the details and how to reproduce them, and give us a chance to fix it before you publish.
Email a security reportContact
Organizations, agencies and teams.
Looking at ZYRNTOPO for a SAR unit, an agency or a field team? Tell us how many devices and which platforms you need, and we'll tell you what works today.
- [email protected]
- Company
- Grange Dev Group
- Location
- Washington State, United States
- Refunds
- 14 days on Pro, see the refund policy
Data sources
Built on public and open data, credited where it is used.
The renders on this site are computed in your browser from the sources below. The app credits each of its providers in the map attribution.
| Data | Source | License | Used for |
|---|---|---|---|
| Elevation | USGS 3D Elevation Program, through the Tilezen terrain tiles on the Registry of Open Data on AWS | Public domain | 3D terrain, contours, slope, viewshed and profiles |
| Imagery | USGS The National Map aerial imagery | Public domain | The imagery basemap in the renders |
| Glaciers, trails, peaks and the route | © OpenStreetMap contributors | Open Database License | Labels, glacier outlines, trails and the Disappointment Cleaver route |
| Product screenshots | ZYRNTOPO and ZYRN Workstation | © Grange Dev Group | Device figures |