Start the app and set your anchor position. An acoustic and visual alarm goes off as soon as the max. configured anchor distance is reached.

The app requires high accuracy for the location.

No ads, no fancy maps. It only cares about the alarm distance to your anchor location.

This said, by using the app you agree that you take full responsibility for you, your crew and your ship. In addition, the usage of the app is without any warranty nor guaranty.

Anchor distance to trigger alarm is between 1 and 100 meters. Default is 20 meters.

App has an option to show additional information like speed in km/h, bearing, current location and status information.