Im very pleased, have to tell someone! Just got Pitch and Roll working on my Trek Transponder. So you can send an SMS to your boat and check out the sea conditions where it is or check if boat is listing. You get 15 pitch and roll numbers (degrees) taken at 1 second intervals. It uses an electronic accelerometer which measures force of gravity and calculates into angles. Looking at the ping below Trek is rolling very slightly but is pitching bow down. I would welcome comments on any better format? Maybe it should also measure "heave" ?