improve default map zoom level on start/GPS fix.

[AndKe]

Every time I use AndroPilot, I start off by zooming in, a lot, on the map. Please,once decent GPS fix is achieved, switch to a zoom level that displays no more than 500m across the device screen.
If for nothing else, then I do it to confirm actual position is "good" A higher zoom level at start would be "better" for most use.