Android App Development

I just spent 1.5 hours getting an Google Maps fragment working in a test app. It seems like a kind of difficult API to get things done with.

I want to make an app where users can plot and upload street routes to a server, and then the app will time how long it takes you to complete the route, basically a street racing leaderboard app.

Does anyone know how difficult it would be to do this?
Keeping the GPS based times accurate to the second might be difficult.

>>4
The idea is that the routes will be predetermined by users, I'm just thinking about that delicious mountain roads that have shitty service giving lucky people horribly inaccurate times.