In 3D mode and when rotation mode is enabled upper part of screen is used to rotate view.

Keyboard controls:
Arrows - scroll/rotate the map,
Dot - zoom out,
Enter - zoom in,
Space - toggle "follow me" mode,
Q - quit application,
B - [very experimental, new in 0.3.9] download (blocking operation) and show 3D buildings in near area, will work properly only for zoom 17 and higher,
G - [debug] toggle grid,
C - [debug] toggle current latitude and longitude and distance from current GPS position.
H - [debug] show tile arrays with states and visibility range
When Shift is pressed zooming behaviour is altered.
X - toggle accelerometer usage. Accelerometer is calibrated in the moment it is enabled.
N - switch to next tile provider. See /opt/cloudgps/providers.ini file.
Shift + N - switch previous tile provider.
S - switch to next search provider (currently CloudMade and Google addres search are supported)

Shift + tap on screen - add temporary marker where clicked (works properly only in 2D)
O - add temporary marker on screen centre.
Backspace - return to previous position after pressing "my location" button.

When search bar is active keys are used as text input. Only ASCII characters supported right now. Use Enter to search query.