Forget GPS and use WII remote. There is already many projects + maemo garage projects Py Axel Wii (http://pyaxelwii.garage.maemo.org/)

Well you could use gps for accuring and sync location coordinates when you are standing still (GPS accuracy as it best). I believe this could be great feature for maemo mapper as well. N800 users wouldn't even need gps because they could just point out start position at map layout. Thats assuming they know where they are.