Anchor Alarm with Late Set 4+

Anchorages, Find My Boat


    • 4.6 • 314 Ratings
    • $3.99


The Anchor Alarm app lets you feel safe and secure when on anchor.
You get instant alerts and notifications when your anchor drags or the GPS reception degrades.

The app comes with an option for late set: in case you forget to set the alarm when you drop the anchor, you can still do it later.
You can also adjust the anchor position manually on the map screen.
You can also manually enter the anchor coordinates, in case you saved them on another device.
If you decide to take your device ashore, you can pause the alarm and reactivate it later, when you return.

The boat movement is recorded and a track is displayed on the map screen.
The app runs in the background and requires no internet connection.
The app supports dark mode and has simple and native user interface.

The app can remember the location of your boat when you leave and point you to its location later.
In can also point to your last anchor position in case you forgot to set the boat position.
Useful in crowded anchorages or when on your dinghy.

The app includes a map of more than 8000 anchorages around the world for free, showing depths where available.

The application allows you to personalize your experience through customizable settings such as:
• measurement units
• alarm sounds
• GPS accuracy threshold
• The time before a bad GPS accuracy alarm is triggered

The app supports Apple Watch. In addition to the distance to the anchor and GPS accuracy, you can monitor the boat speed and heading.

You can create Siri shortcuts to start and stop monitoring.

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What’s New

Version 5.6

Fixed an issue when the app can become irresponsive after monitoring for many hours.

Ratings and Reviews

4.6 out of 5
314 Ratings

314 Ratings

Appariton.Ascendant ,

Great app for cruising sailors.

Initially I had some questions regarding using the app, the developer responded very quickly and was helpful. There are a few quirks to get used to, such as the display always reading North up, but once you understand how it works it works great.

The app itself is a lifesaver. I sleep better at night with it running in the background on my phone. The car horn alert wakes me instantly. If you’re a cruising boat and basically live on the hook, this app is a must have. I tried a couple different ones, including the ones included with my navigation software, but this app is the easiest to use and works as advertised. I use it every day and highly recommend it. SV Apparition.

Ethanlbc27 ,

Makes you a moderate paranoid!

I am always highly observant and extremely paranoid when I anchor close to the moored boats, rocks, etc. Sailing solo is fun and rewarding yet it comes with its arguably negative perks. Keeping an eye on the anchor especially during night time is one of them.
Although I have only used the app two nights during my anchorage at Emerald Bay in Catalina Island, I can easily say that it immediately became my peace of mind tool...

Unsolicited advice: Learn to anchor properly before relying on your apps, software or your navi. Cause you’re not anchored properly, they will keep you up all night...
Happy anchoring!

autrain river ,

Not Performing

Bought this app with the hope the positive reviews were accurate. I’ve used the alarm app on a mooring buoy in the San Juan’s to gauge accuracy. The alarm shows the boat moving out of range and alarms frequently. Considering I’m on a buoy connected to the ocean floor with a helix you would think the boat would not move out of range. I’ve tried set and late set and played with parameters. If I’m doing something wrong would appreciate developer feedback.

Update: the developer reached out to support. However, in using the app it’s important to give the app time to get an excellent gps fix. After waiting and then starting the app it performed as expected.

Developer Response ,

Hi, can you please send us an email to and we’ll be happy to assist you.

App Privacy

The developer, B2N LTD, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Identifiers

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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