Pocket Ping is an application that allows you to record your personal location diary and display the results (we call them TreadCrumbs) real time in the app or on the web. You can also easily share your TreadCrumbs with your friends ... and the best is, it is totally free, anonymous and requires no registration. And to make it even more fun, you can see one friends TreadCrumbs in the app alongside your own!
Continued use of GPS running in the background can dramatically decrease battery life.