Anchor Pro 4+

Best anchoring companion

IdeaBoys UG

    • 4.8 • 1.3K Ratings
    • Free
    • Offers In-App Purchases


Anchor Pro tracks your location and alerts you if your anchored boat starts drifting. Relax while anchored and sleep better! You can also be alerted on a secondary phone.

Anchor Pro allows you to set the anchor location directly as you are setting the anchor, or specify the location of the anchor later by providing distance and bearing to the anchor. More advanced users can also specify the coordinates of the anchor.

You can specify the allowed area to be a simple circle around the anchor location, or opt for a more advanced area by providing two different distances at specific angles.

The application provides you with enough data to keep you on top of every movement of the boat. You can review all the data from the main screen or graphically check position on the map where you can also see how the boat moved around — perfect for analysis if the anchor is holding or dragging.

The application allows monitoring of the position, GPS reception, and battery level. You can get alerted when any of those metrics reach certain thresholds.

When you are not on a boat you can leave the phone there and get alerted in the event of an alarm. You can be alerted via instant message using a Telegram app or via an email message. With Telegram,​ you can also request the status of the application at any moment.

You can use the Apple Watch app to always have distance, bearing and battery level available in real-time — from your wrist.

The basic functionalities of the application will always be free to use and you have a possibility to test all of the premium features for free as the subscriptions offer a free initial trial period.

Anchor Pro is ad-supported. If you choose to purchase an Anchor Premium subscription to remove ads and get extra features, payment will be charged to your iTunes Account at confirmation of purchase. Subscription automatically renews for the same price unless auto-renew is turned off at least 24-hours before the end of the current period. Auto-renewal may be turned off at any time by going to your Account Settings after purchase. The current price for Anchor Premium is $4.49 USD per year and may vary from country to country. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable.

Anchor Pro's terms of use:

Anchor Pro uses background audio and location update modes to keep you alerted when the application is not in the foreground.
Please note: Continuous use of GPS will cause the battery to discharge more quickly.

What’s New

Version 2.4

We're always making changes and improvements to Anchor Pro to ensure that it fulfills your expectations.
Changes in this version:
• Improvement to backend communication to improve reliability

Ratings and Reviews

4.8 out of 5
1.3K Ratings

1.3K Ratings

LOVEato ,

Mooring movement

I have been on a mooring in Catalina which has bow and stern pickups so needless to say the boat stays in one place. I set my alarm with a 60 foot radius. The alarm went off three times during the night and we had not moved. It seems the accuracy of the gps is not very precise compared to other devices. This needs to be taken into account when setting distance. Due to this you will need to set your radius further than most would like diminishing the whole premise of the app. ALSO the feature in which you can reset the position of the anchor by dragging it on the map (which is a great idea) does not work on my devise which is an iPhone. Otherwise I think the ease of use and design is great.

znuttyone ,

Solid app , a few suggestions

The app does what it’s designed for and does it well. I used it in 14-18mph winds and a high tidal flow area so the boat had a 180 degree swing. As I monitored our position on multiple devices this app was relatively accurate ( iOS gps accuracy could be better) . The interface is very intuitive and straight forward. All in all great job sloth

Suggestions : 1-provide an icon to increase / decrease radius or maybe allow user to drop anchor and then have a settling period where you monitor the speed and drift to determine anchor heading along with rode deployed
2- allow anchor review input , maybe ask for specific info like protection , bottom holding , need wash down , etc and link to active captain account to feed reviews. You could also pull anchorage info from AC and provide a richer Experince to users
3- with tracking of boat movement allow changing the track color , the current color is hard to see in certain lighting
4- Scan WiFi connection for nema2000 GPS and allow to switch to it as primary GPS for higher accuracy. Maybe even have redundancy and intelligence to validate on device against another ( I have two GPS on the boat , one for ais, one for navigation + the iOS device )

Thanks for contacting me ... look forward to seeing the enhancements

Developer Response ,

Dear user, thank you for a really helpful review! I will note the suggestions and try to include them in the next versions of the application.

TwoHulls ,

Sleepless in the Caribbean

The Anchor Pro application has several interesting features and modes in which to set the anchor position: Current Position, Relative, or Absolute Coordinates. Did not test Current Position mode. However, either due to GPS errors or underlying software error, Relative and Absolute Coordinate modes to not work well as if there is geometry rotation error or worse, no filtering of position, velocity, heading and GPS DOPs. This results in repetitive false alarms and need to continually increase the allowable anchor distance to unacceptable values and erroneous tracks. In several cases Anchor Pro position track was well forward over my 120 anchor rode length and anchor location while in 23 knots of wind. Note that the IPhone placed in unobstructed clear sky. AnchorPro reported GPS accuracy of 13 to 20 feet.

In my test case, anchored on catamaran in 25 knots with cross swell and tide. The yaw rotation as well as swing causes havoc with AnchorPro positioning and short baseline position calculations.

Comparing tracks and actual anchor position if my B&G Zeus system chart plotter vs Anchor Pro makes the error in Anchor Pro obvious. Screen caps of tracks of B&G vs AnchorPro sent to the developer - ideaboys

Promising but needs better positioning and filtering algorithm. Doesn’t appear to have an update in 8 months. Hope IdeaBoys addresses this otherwise useless to me.

App Privacy

The developer, IdeaBoys UG, 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 Linked to You

The following data may be collected and linked to your identity:

  • Location
  • Identifiers
  • Usage Data
  • Diagnostics

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Location
  • Contact Info
  • Diagnostics

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

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