Be alerted if your anchor drags with a simple yet full of features app : Easy to use - Late set - Remote mode - Dark mode support - Arc or circle Perimeter - Watch app - Find my boat

Press the main button (anchor down) to set anchor position,
Touch the alarm circle on map to adjust alarm radius and you're ready.

Press the main button (anchor up) disables all alarms.

Main button to set anchor at your current position,
Choose a position on the map: relocate anchor with drag and drop.

Either set a value in settings,
Or adjust it directly by touching the alarm circle.

ALL INCLUSIVE: No add, no subscription, no in app purchase add on.


Attention catching visual alarm with a blinking black/white screen (foreground only),
Accoustic with ringtone choice (iPads needs to be unmuted in the Control Center),

REMOTE MODE: check your position and get alerted on a second device.
FIND YOUR BOAT: dinghy option in remote mode

FIND MY BOAT: Crowded anchorage? The remote features a dinghy mode that will shows directions to your boat.

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.

WATCH COMPANION APP : anchor, snooze and stop alarms from watch.
Watch notifications are less intrusive and will silence the phone notifications. We thus recommend to opt-out watch notifications.

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.

Enable, disable and reset the track. Export it in CSV or GPX format.

Vertical map scale in feet or meters.

User interface compatible with dark mode for night use.

Compatible with flic and flic V2 buttons, no hub required. flic buttons are splash proof smart buttons and you may use them as a remote to set, snooze and stop alarms.

Strictly respects your privacy: we do not collect any of your personal information, ever.

Compatible with external GPS for best accuracy (required for iPad with no gps) : tested on gns2000 , Dual xgps, Bad Elf and Garlmin glo.

Compatible with Flic buttons.

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 6.12

IOS 14 compatibility

Ratings and Reviews

4.8 out of 5
34 Ratings

34 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.

Sama wilkins ,

It works

Make sure you are next to the deployment point when you drop you hook, otherwise if you are on a 10m boat & you are at the helm, your readings will be 10m out... otherwise it works... if you go ashore for lunch: you’ll have to leave the phone with the app on board and get messages sent to your other phone... and you have to have a signal on both phones for it to work... so you still have to check your boat’s position, it is useful at night as an additional alert... but have several means to check you position...

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.

App Privacy

The developer, Marie Hullo, has 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 Not Collected

The developer does not collect any data from this app.

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


Marie Hullo
15.2 MB

Requires iOS 12.0 and watchOS 6.0 or later. Compatible with iPhone, iPad and iPod touch.


English, French

Age Rating
This app may use your location even when it isn't open, which can decrease battery life.


  • Family Sharing

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

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