Unreliable GPS is shown immediately. The separate descending GPS warning sounds after the selected delay; three fresh usable readings confirm recovery.
Keep this page open and your screen awake. Browser alarms cannot be relied on with the screen locked or the app closed.
Night view starts off when you open the preview. Satellite is the default map; your later map choice is saved.
Acknowledging silences this warning for 60 seconds. The watch continues.
Missed the moment it dropped? Estimate its position from your boat, or choose it on the map.
Use a compass for the bearing (0° north, 90° east). This web preview does not read the phone compass. An estimate is only as accurate as your input.
Completed watches saved in this browser.
GPS tolerance is the largest reported position uncertainty accepted for monitoring. Automatic uses 40% of your swing radius, capped at 25 m. A larger tolerance admits less precise fixes. Positions older than 20 seconds are not used.
An outside-circle warning requires fresh, distinct GPS fixes over at least two seconds, with the reported GPS uncertainty also outside the circle. Poor GPS explains whether the signal is missing, old or imprecise; it cannot reliably confirm a boundary crossing.
This browser preview cannot provide a dependable overnight or background safety alarm. Wake lock and audio depend on your browser and device settings. Closing the page or restarting your phone stops monitoring. Your anchor is saved, but you must reopen and resume with fresh GPS.
Satellite and Hybrid use Esri imagery; Standard uses OpenStreetMap. These are reference maps, not nautical charts or live depth readings.
No account is required. Anchor coordinates and completed watches stay in this browser's local storage. Clearing website data deletes them. Map providers receive your IP address and the map area requested. Demo data is kept separate from your real anchor and logbook.
In the iPhone app, start a watch and choose Menu → Share with shore. Share its private link with someone ashore. The browser must remain open for shore alerts. Shore companion instructions.
Estimate the horizontal reach of your anchor rode, plus the distance from bow to GPS and your chosen allowance. All dimensions below use meters.
Straight-line geometry only. Enter the expected water depth yourself, accounting for tide. This does not choose safe scope or account for chain sag, weather, hazards or nearby boats. Review the circle before applying it.
North up · Simplified recorded track. Dashed circle is the final swing limit; the limit may have changed during the watch. GPS gaps are not proof of a continuous path. Replay does not change your current anchor.
Anchor Eye requires JavaScript for GPS monitoring and the map.
Anchor Eyeby yakpakUnder developmentAnchor Eyeby yakpakUnder development