Anchor Watcher Anchor WatcherSet your anchor zone (circle/ellipse/polygon), monitor in the background, and get smart alarms if your boat drifts.
No account required. Works offline.
Define circle, ellipse, or polygon zones for complex anchorages.
Switch between OpenSeaMap and Satellite basemap overlays.
Tunable accuracy thresholds and wait timers reduce false alarms.
Runs in the background with useful notification actions.
Export CSV of your track for logs and evidence.
On‑device settings, no signup, and no analytics by default.
Anchor Watcher is free. If it helps you sleep better on the hook, consider a small donation.
On Android, donations are available via in‑app purchase. External support link optional.
An app that monitors your position relative to a set anchor and alerts if you drift beyond a safe zone.
Yes. OpenSeaMap tiles cache during use; satellite imagery depends on availability. GPS works offline.
OpenSeaMap and a Satellite basemap view.
iOS is coming soon. The App Store button shows a notice until it’s available.
No analytics by default. See our Privacy Policy for details.
You can set an accuracy threshold and a wait timer so alerts only trigger with reliable GPS fixes.
You can configure a delay before the alarm triggers when outside the zone to avoid transient GPS spikes.
Yes, you can export a CSV of your track for logs or sharing.
Keep the phone powered, disable unnecessary radios, and choose reasonable update intervals.
No. Always maintain a proper anchor watch using multiple methods according to best seamanship.