Anchor Sentry

Anchor Sentry

by Michael Dieter Konz

4 ratings
15 reviews
$3.99

Details

  • Released
  • Updated
  • August 8, 2018
  • July 11, 2026
Anchor Sentry screenshot #1 for iPhone
Anchor Sentry screenshot #2 for iPhone
Anchor Sentry screenshot #3 for iPhone
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About

This app monitors your ship's position while anchored, alerting you if the anchor drags and the vessel moves outside a set perimeter. It offers advanced features like distance circles, prohibited zone alerts, and background operation for continuous monitoring.

Anchor drag and perimeter breach alerts
Map display with Google Maps or Navionics
Prohibited zone setup with alerts
Background operation
Multi-device sync functionality
GPX track saving
Favorite anchoring place saving
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What's New in Anchor Sentry

2.11.3

July 11, 2026

- Fixed the alert and anchor state shown on the mirroring/proxy server sometimes getting stuck after an alarm was acknowledged, even though the boat was no longer in an alarm condition. The current state is now sent immediately when an alarm ends or transmission is stopped, and is repeated on every transmission instead of only when it changes locally, so a single lost update can no longer leave the server out of sync permanently. - Long-tapping a saved anchor place on the map now offers "Show Picture(s)" (if any are saved for that place) and "Edit". Pictures open directly in a new, simple full-screen viewer with the picture's description shown underneath, without going through the place editor. - Fixed a possible app hang at startup. Navionics initialization is no longer done synchronously during app startup, and a redundant, near-immediate rebuild of the Navionics map screen right after launch has been removed.

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User reviews

Viele Einstellmöglichkeiten und absolut zuverlässig

Nach diversen Apps endlich eine die überzeugt! Es sind diverse relevante Einstellungen möglich. Trotzdem übersichtlich. Und vor allem, sie ist zuverlässig.

Mirroring

I went through a few Anchor apps two of them so far gave up the bearing and then in Support and Anchor pro was talked about a lot online, but you have to do a prescription and then another prescription of telegram app. It’s ridiculous and it’s delayed. Anchor Century is working as advertised to your phone every few secondsI’m gonna rip the update that doesn’t run.
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Mirroring not working

Despite several hours of trying to establish a remote monitoring capability using the mirroring feature, unfortunately the remote device would show the location of the transmitting device but would not trigger an alarm. I did get this to work once, but then had to unregistered and re- register the sending device each time otherwise the receiving device won’t alarm. Even after doin this it was still random as to whether the remote device would alarm. Works well as standalone anchor alarm! But mirroring is what I purchased the app to deliver. Maybe it works for others…?
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A bit buggy

Have used this app for a couple of years. For some reason it has gotten buggy. Looses track of where I drop. Plus it has position lines zooming out of anchor circle all over the place.

Response from developer

Erratic lines all over the space are an indication that there is a problem with the GPS signal. This can have many reasons, none of them the app can anything do about. GPS is a radio signal and as such can be disturbed. Even having the device resting close to a desktop computer can disturb GPS reception.

Guter Ankeralarm

Vor allem die Synchronisation auf ein zweites Gerät ist super praktisch. So hat man auch unterwegs an Land immer ein Auge auf das geliebte Bötchen 🙃

Developer apps

FAQ

What is Anchor Sentry?

Anchor Sentry is a navigation app designed to monitor your ship's position while anchored. It alerts you if the anchor drags or if the vessel moves outside a pre-defined perimeter, ensuring your safety at sea.

How does Anchor Sentry monitor anchor position?

The app uses your device's GPS to track the ship's current position on a map. It allows you to set distance circles and prohibited zones, triggering alerts if the vessel deviates from the set anchor position.

Can Anchor Sentry be used with Navionics maps?

Yes, Anchor Sentry can display Navionics maps. Users with an active Navionics subscription in the Navionics Boating app can register with their Navionics credentials to access these maps within Anchor Sentry.

Does Anchor Sentry work in the background?

Yes, Anchor Sentry is designed to run in the background, allowing you to use other apps on your device while still receiving continuous monitoring and alerts for your anchored vessel.

What is the cost of Anchor Sentry?

Anchor Sentry is a paid application, priced at $3.99. This one-time purchase provides access to all its features for monitoring your ship's anchor position.

Is Anchor Sentry suitable for all ages?

Anchor Sentry has an age rating of 4+, making it suitable for younger users under supervision. Its primary users are experienced boaters who require advanced navigation and safety features.

How often is Anchor Sentry updated?

The latest version of Anchor Sentry is 2.9, last updated on March 12, 2026. While specific update frequency isn't detailed, this indicates ongoing development and support for the application.

Can Anchor Sentry alert me to nearby ships dragging anchor?

Yes, Anchor Sentry offers a proximity alert feature for ships also using the app. This allows you to be warned if a neighboring vessel's anchor is dragging, enhancing overall safety in anchorages.