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 ...)
- 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.

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 is experimental as it uses an external server that could be shut down without notice by it's provider or run slow .

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 5.05

Reliability enhancement : auto relaunch app in background

Ratings and Reviews

3.9 out of 5
35 Ratings
35 Ratings
GordonC53 ,

Great Anchor Watch App

Just took a trip from Seattle to Glacier Bay AK and back using this app and it worked great. Just launch the app when you are ready to anchor and set the anchor location when you drop the hook. It will track the boat position from that point forward showing on the screen everywhere the boat has been since the set. It allows you to then set a radius alarm for any distance but since it will show the boat position when you back up to set the anchor you will see the radius at that time. Very reassuring to know how your boat is tracking and to do a quick check at night. It does consume a lot of battery so we run it with an iPad left charging. The app works in background as long as you don't close the app so you can use your device for other things and come back to the app and it will show the tracks made since you left it. Need to put your device in a location where it both gets GPS and someone can hear the alarm. Anywhere in the main cabin worked for us. It works with or without internet.

bahamas dude ,

Takes a while to figure out.

I wish there was a bit more information spelled out. It works great when figured out. But I can’t tell which direction is which so when I need to move my anchor mark I can’t tell where to move it. The compass button doesn’t seem to show anything. Eventually I see where I am swinging and move the anchor to what makes sense.
It does use a lot of battery power.

Developer Response ,

Dear Bahamas Dude, Thanks for your review, the last version features a few improvements based on it.

The phone’s heading is rarely reliable enough to set the anchor in the right direction.

When you move the anchor, the anchor bearing and distance is shown at the bottom of the screen. To first set the anchor I use the direction given by the boat’s compass as the bearing and I add the chain length and boat length as the distance (Boat length because I usually do it from the cockpit near the stern).

I then add the accuracy (5 to 10 m) to adjust the circle radius.

As you do, I adjust the position later according to the swing shown by the track.

1952Bella-Dog ,

Need some help!

I downloaded the “Anchor!” App today after Active Captain comments as to how good it is. The instructions in the app are straight forward, however I have been unable to get the app to accept my “sending” email and it keeps asking me to redo it saying it is not a correct email. When I enter it and do a “test” it works. Then forgets it. I must be doing something wrong however I cannot determine what after 10-12 retries. We are cruising the Chesapeake Bay and could use a good app. Can someone please advise what I’m missing?

Developer Response ,

Some email provider filter our mails, please check your spam folder, if the message is missing there also, you can make an in-app request for help (settings>bug or suggestion). Also there has been some server maintenance the second week of june and you might have tried the mail at that very moment.


Marie Hullo
8.6 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.
© 2013-2018 A. Arnail


  • Family Sharing

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

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