This is our first app and after weeks of development we have it ready to go. Carpool Calculator uses your phones GPS to track your trip and charge everyone on the trip for the exact distance they traveled. So if you have passengers that get in at different times they get charged only for the time spent in the car. If you are a carpooler, and in this economy it really pays to be, this is the easiest way to keep up with who owes you money. Thanks for the support.