Anchor Alarm by SailGrib, is a modern full featured anchor alarm app. - Start the app before your anchor, the app will record and draw your track on a map. - Leave your phone on the chart table. - Moore without worrying about the application. - Return to the application.On the track, locate the point corresponding to the boat's position at the time of anchoring. You should be able to detect it relatively easily on the map thanks to the reverse movement after anchoring. - Center the map on the