Be alerted if your anchor drags with a simple yet full of features app :
- Easy to use: Click once to set anchor position, touch the alarm circle on map to adjust alarm radius and you're ready.
- Easy to set anchor position:
-> a button to set anchor at your current position
-> choose a position on the map: relocate anchor with drag and drop.
- Easy to use with standard map gestures (zoom, scroll ...)
- Remote mode : check your position and get alerted on a second device
- Enhanced track recording: The boat track is recorded and a time - colored path is displayed on map. You can identify at first glance whether your anchor position is drifting or not.
- Track management: enable, disable and reset the track. Export it by email in CSV format or GPX format.
- Possibility to choose the ringTone
- Works offline ! You still see your boat position relative to the anchor, the anchor position and the alarm circle. Once offline the map is replaced by a graphic.
- 3 alarms methods :
-> Attention catching visual alarm with a blinking black/white screen,
-> Accoustic alarm,
-> In background: accoustic alarm with a notification.
- Mail alert
/!\ On some iPad models, you'll find Mute in the Control Center. Swipe up from the bottom of the screen to open the Control Center then disable Mute.

- Easy to adjust alarm distance:
-> either set a value in settings
-> or adjust it directly by touching the alarm circle
- Vertical map scale in feet or meters as you prefer.
- User interface darkened to help preserve night vision.

- No add
- Strictly respects your privacy: we do not collect any of your personal information, ever.


A review by Paul Shard (famous for the award winning cruising documentary Distant Shores): Well I have finally found a solution that works GREAT in the form of an App for my phone! I have been testing it for some time, but they recently came up with an update and it is now really great!

check the full review here:
Compatible with external GPS : gns2000 , Dual xgps, Bad Elf and Garlmin glo. With an external GPS you can use Anchor! on a Wifi only iPad and get improved accuracy on other models.
Compatible with Flic buttons (Bluetooth low energy buttons, they are splashproof, work locally and no hub is required to work with anchor)
Your 5 star rating on the app store makes us work harder to provide updates, don't hesitate to rate Anchor!

legal notice:

When the alarm is on, this app will use GPS in the background to be able to alert you. Continued use of GPS in the background can dramatically decrease battery life: don't forget your charger on board.

The remote mode uses an external server that could be shut down without notice by its provider or run slow . The remote mode needs data connexion and 2 apple devices

Use of the remote mode comes is subject to the agreement to this supplementary copyright notice:
In addition to the applicable standard EULA, permission is not granted to use Anchor! to track someone without his dedicated and recent consent.

Provided maps are not nautical charts.

What’s New

Version 5.08

Added compatibility to Flic buttons (Bluetooth low energy buttons, they are splashproof, work locally and no hub is required to work with anchor)

Ratings and Reviews

4.8 out of 5
20 Ratings

20 Ratings

Bill F! ,

Brilliant app and brilliant support

I have been using this app for a number of years with great pleasure. Previously my wife was the anchor alarm, being a very light sleeper. Since using the app she has been delighted to be able to sleep soundly.

The remote monitoring feature is invaluable. In short, you get a mirror image of the active apple device on the boat on the second device you take ashore. This shows when last it connected to the boat, so you can be sure the image is up to date and you will get an alarm if the boat drags.

I was very upset recently when I was unable to get a connection between my two devices. I contacted the developer and Antoine provided an immediate and comprehensive investigation to track the fault. Eventually this was traced to a content blocker set up as a default on my iphone - easily fixed once identified, but a lot of ingenuity and persistence needed to get to that conclusion.

My thanks for a great app and superb support.

Nimrod104 ,

Great app

This was pretty good before but now that I can monitor the app whilst ashore is a real improvement. Easy to use and clear. My only gripe would be that it would be nice if you could move the anchor by entering the coordinates rather than move the pin on the screen.

I recently had a problem with the monitoring on my iPhone. The support was excellent and it turned out that Vodafone Securenet had stopped the sharing so as soon as I entered the website as a trusted site, all was well again. Great app.

Suki-at-large ,

Trustworthy, dependable and awesome

We’ve used a few anchor alarm apps and we’re really loving this one. The standout aspect, and the one which made us trust it is the fact it does actually mimic the boats movements, and tracks them. First time we tried it out was during the day and we sat and watched it’s every move and sure enough it recorded every swing. Seems to use relatively little battery/data too so we leave it on at night and have a nice peaceful nights sleep. Use it! 👍


Marie Hullo
9.1 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad and iPod touch.


English, French

Age Rating
Rated 4+
This app may use your location even when it isn't open, which can decrease battery life.
© 2013-2019 A. Arnail


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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