A free app for Android, by Sentinel Marine solutions.

Sentinel is a free app that enables you to monitor the state of your boat, whether it is at a marina or on the water. It does this by constantly checking the status of the various systems on board. If something does not look right, it will send you an alert so you can check it out. You can also use the app to get an overview of the most important information about your boat.

You will be able to see the status of the various systems on board, such as the water level, the engine power, the battery level, etc.

The app will also be able to provide you with an overview of the most important information about the route that you are on, such as the location, the speed, etc.

The app will be able to provide you with an alert if the boat moves in an unexpected way, such as if it is moving too fast or too slow, etc.