For Android, you have MarineSecurity
The first have 2 features:
1- Anchor alarm when you are on board
2- Watching against the theft when you are not on board. It sends you SMS message on an other phone with location when the boat moves.
The second, MarineSecurityMap, converts the SMS messages received, in points and traces on a google map view.
Vous can have more info here http://marinesecurity.free.fr
or here https://market.android.com/details?i...h_result&hl=en
About necessary current, with my HTC Wildfire, I have noted the following values:
Phone with adapter 12 V plugged on board (90 mA)
Phone with adapter 12 V plugged on board and MarineSecurity active on phone (115-120 mA).