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.

Like us on Facebook or join our group to get updates on what's going on with the apps, get help or suggest features.

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 4.5

You can create Siri shortcuts to start and stop monitoring and you can start and stop monitoring from your Apple watch.

Ratings and Reviews

4.4 out of 5
106 Ratings

106 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!

Piedmonster ,

Great anchoring aid

This app is wonderful. What sets it apart from others is your ability to do a “Late Set”, or activate after the anchor has been dropped and the chain/rode let out. Standing on the bow, playing with an app while anchoring is dangerous and easily could lead to losing your device.

Not so with this app. Simply point your device in the direction of the anchor, enter the amount of chain/rode let out, and the depth and you get an accurate display.

One word of caution. Distances are calculated to the device. If your iphone or iPad are in the cockpit or cabin, you’ll need to add the distance from the bow to the device to the amount of chain/rode used. Also you’ll want to add that distance to the safety perimeter so that your device remains within the confines of the alarm area.

I’ve communicated this to the developer and hope to see this incorporated if a future update.

I’d recommend this app to anyone dropping a hook anywhere anytime. Two thumbs up!


77.7 MB

Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.


English, Bulgarian, French, Italian, Portuguese, Spanish

Age Rating
Rated 4+
This app may use your location even when it isn't open, which can decrease battery life.
© 2017-2019 B2N LTD


  • Family Sharing

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

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