Geofence demo app for N900
Here's a screenshot of demo Geofence app using bluetooth technology. Geofencing app creates a virtual perimeter around a location of interest,e.g. your laptop, and triggers an alert when an application user exits this perimeter. When the app detects motion via accelerometer (e.g. user has started moving), it kicks-off a bluetooth scan. If the paired device is out of range, it triggers an alert.