i can turn on my computer on the boat(which most of us do, or just check it at my hotel room) then when i go in the water below 1 meter it will turn on. After you get out it will turn off automatically after 10 min...
the computer does not detect salt water or fresh water...
but still isnt it a waste of battery to check the pressure sensor every minute? i can descend 10 meter in less than a minute, so i dont think it checks the pressure everyminute..
mmmmm...
i once saw an application with a water container that had two plates when the water reached tthose plates.. the valve will turn off to stop filling the container with water.. thats why i guess it has something to do with it...