Markers are shown for exits with a field GPS position saved on this phone, a location resolved from the exit address, or a built-in AI estimate that works fully offline. Exact field GPS always overrides the rest.
Field Mode
Find the nearest mapped emergency exits using your current GPS position. Only exits with a saved field GPS or cached map position can be ranked.
Backup & Restore
On iPhone: Share → Add to Home Screen.
Nearest mapped exits
Visited on this device
GPS Builder
Build a verified location database one exit at a time. AI estimate positions are unverified starting points computed offline from street/distance text. Address-derived positions are live-geocoded and approximate. Field GPS should only be saved while standing directly at the correct emergency exit.
Offline & Device Tools
Prepare the app for weak-signal areas, review browser capabilities, and manage locally stored photo files.
Offline Photo Pack
Download all catalog photos to this device. The core app and database are already cached by the installed PWA.
Storage
Shows an estimate of storage used by this browser for the app, maps, photos, notes and GPS data.
Device Diagnostics
Quick compatibility check for Android, iPhone and iPad.
Installation
Android: open in Chrome, then Install app or Add to Home screen.
iPhone/iPad: open in Safari, tap Share, then Add to Home Screen.