Anchor Sentry monitors the ship's position at anchor and warns the skipper if the anchor is dragging and thus the ship leaves the setup perimeter.


  • Show current position on GoogleMaps map or on a Navionics chart[1,2]
  • Distance circles to help finding a good anchor position
  • Drop anchor by tapping on map or by position or by bearing and distance
  • Can be used for anchoring with shore lines by watching the heading rather than the position[2]
  • Option to set up prohibited zones which will trigger an alert when entered. These can be used indepent of the anchor state
  • Runs in the background even while other apps are used
  • Unique sync functionality which allows to pair two or more devices together to see the ships position even while out to shore for dinner
  • Proximity alert at anchor between ships that both use Anchor Sentry
  • Optional compass overlay to help finding the bearing to the anchor[2]
  • Several setup options to customize your app
  • You can provide a password to friends and family to see your latest position on this website
  • Barographfunction for devices with appropriate hardware (most newer iPhones and iPads)[2]
  • Display of actual depth from echosounder (NMEA server required to provide the data)[2]

[1] To use the Navionics charts you need an active subscription with Navionics.

[2] Only available on iPhone® and iPad® at the moment.

Please note that the Android version does not currently support all described features.

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