In this game, you are given a limited supply of ammunition to use to sink the ships. For that you have to navigate to a certain spot and push the fire button 
. Just as with traditional games of Battleship, you must cause damage along the length of the ship in order to sank it. For instance, in traditional Battleship, a submarine must have three hits before it is sunk. In this version, a submarine is composed of three zones, which all must be hit in order to sink the ship.
The coordinates for the final geocache will be revealed/put in your inventory after you sank all the ships !
Download cartridge (juin 2014)
Cartridge was tested and works best on an IPhone 4 !!!!
Garmin Colorado works fine too (but no map display)
Garmin Oregon seems to have difficulties even starting the cartridge
A word of caution : Please prepare you game in advance knowing that the battlefiled is a circle of about 70m diameter and that you have following ammunition at your disposal:
- five 155mm shells, range 12m
- ten anti-tank shell, range 9m
- twenty-five small shells, range 6m
And do yourself a favour and do not try to do this on your own - at least 2 people will be necessary to have a good time playing this cartridge. You may even play it as an anywhere cartridge to get an idea of what awaits you :)