The Anchor Alarm comes with options 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 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 app has a dedicated map screen, where you can see your surroundings.

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.

The app includes a map of more than 8000 anchorages around the world for free.

The application allows you to personalize your experience through customizable settings such as:
• measurement units
• dark/light color schemes and an automatic color scheme based on the sunrise and sunset times
• 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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Note: The app may use your device's GPS in order to track your position relative to the anchor. Continued use of GPS running in the background can dramatically decrease battery life.

What’s New

Version 4.7

• Bug fixes

New in 4.6:
• Updated for iOS 13
• New alert to prevent accidental stopping (optional)
• New option for selecting preferred GPS accuracy
• Added more than ten thousand new anchorages

Ratings and Reviews

4.6 out of 5
266 Ratings

266 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, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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