How about having some options on its positioning behaviour?
1) only use celltower info
2) use celltower + GPS it that happens to be on when updating
3) use GPS (activate it)

option 3 could have another setting that specifies the amount of time to wait fot it to get a fix (example: 30 seconds or 1 minute), so the user can limit batt drain.

Splitting daemon, settings and viewer sems like a splendid idea. The daemon should be as lightweight as possible.

Thanks a lot for your work!