I'm working on a mobile application that is meant to send the device's GPS location to a server ever minute or so. We might adjust the time later depending on data usage and how useful a minute interval is when tracking our drivers. The interval between polls will be no more than 5 minutes though.
Anyway my question is would it be more energy efficient to turn off the GPS antenna between polls or should we just keep it on?
Bonus question: Does the GPS use the data plan? I'm pretty sure it doesn't but I haven't been able to find a definite yes or no on this.