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Boat Sentry

By 2BitLogic, LLC

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Boat Sentry was designed by a cruising boater who wanted more options and visuals than was available from the multi-function display screen, the most expensive electronics or the hard to use and limited in scope mobile apps currently available.

Boat Sentry will give you complete control over how you anchor in any situation with any number of anchors. The controls are extremely simple and assistive to give you the most peace of mind while anchoring in and around reefs, shallows, other boats and obstacles.

The Boat Sentry development team wants your feedback to help improve the features that enhance your peace of mind and security while anchoring.  So, we have a feedback form that goes directly to the developers included in the Boat Sentry App.

Boat Sentry Features:
√ All purchases apply to all devices connected using Boat Sentry on the same account
√ All settings are automatically saved in iCloud
√ Configurable Safe Zone Alarms, including Background alert notifications
√ Schedule your location updates to save battery. Pick the interval that you want to enable the GPS to monitor the Boat
√ Built-in proprietary "False Positive" logic to ensure that bad GPS fixes do not cause false alarms
√ Add Infinite Safe Zones!
√ Save and Load your Safe Zones for persistent usage (When on a mooring ball or at a dock)!
    ◆ Dynamically adjust any Safe Zone's Radius/Width/Height to the distance from the Boat by a simple checkbox
√ Back Down the Anchor!
    ◆ Watch the distances between the Boat and the Anchor(s) to ensure that your Anchor is not dragging while you are backing down
√ Project the Anchor!
    ◆ You don't have to use Boat Sentry while anchoring, instead, you can project your anchor in the direction/distance of the actual anchor at any point
√ Internet Required Features (Free)
    ◆ Send SMS alerts to any phone
    ◆ Send an email to any email account
√ Offline Maps (IAP)
    ◆ Use Boat Sentry without the necessity of being connected to the internet
    ◆ Boat Sentry will automatically switch between Online/Offline maps
√ Remote Mode (IAP)
    ◆ Inter-connect multiple devices together using Boat Sentry and Boat Sentry “R”
    ◆ Place one device for an optimal GPS signal to monitor the boat
    ◆ Have another device near you at all times when you are on or near the boat to alert you
√ Safe Zone Types:
    ◆ Arc: Setup your Forward, Aft, Port and Starboard Drift parameters as well as radius
    ◆ Pie: Setup your Aft, Port and Starboard Drift parameters as well as radius
    ◆ Circle: Setup your Aft Drift parameter as well as radius
    ◆ Ellipse: Setup your Aft Drift parameter as well as width and height
    ◆ Box: Setup your Aft Drift parameter as well as width and height
√ Safe Zone Location Types:
    ◆ Custom Location: Tap any GPS location
    ◆ Boat Set Location: Drop a Safe Zone with the Boat's Anchor Set Location as the GPS position
    ◆ Anchor X Location: Drop a Safe Zone on top of any anchor
    ◆ Anchor Midpoint Location: Drop a Safe Zone on top of the midpoint between any two anchors

Notice: As Boat Sentry uses your GPS to monitor your location, which can drastically decrease battery life, it is suggested to always be connected to an external source so the battery does not die when you need it most!

Please be aware that it is never suggested to use Boat Sentry as your sole source for anchoring alerts!

What's New in Version 1.0.1

√ Expanded International Texting Support
◆ 250 providers are now available!


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iPad Screenshot 1
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Customer Reviews


This has much promise but too many bugs for ios 8.4 be considered worthy for a function as important as anchoring watching

Poor directions

Very poor directions and never did figure it out

Don't waste your time

This app seems to use cellular or internal GPS and doesn't have an interface for an accurate external GPS. IT MOSLTY SHOWED OUR BOAT BEING ON THE NEAREST ROAD...skip this one

Boat Sentry
View in iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Navigation
  • Updated:
  • Version: 1.0.1
  • Size: 93.8 MB
  • Languages: English, Catalan, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Traditional Chinese, Turkish
  • Seller:

Compatibility: Requires iOS 5.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

Current Version:
All Versions:

Top In-App Purchases

  1. Offline Map$2.99
  2. Remote Mode$4.99