Sorry, FileWave does not currently support geofencing. Closest workaround I can think of is a custom field with a script to check the public IP. Then create a scheduled report for devices where this custom field is different than your main internet router's public IP. This would at least let you verify if the device has left your network. Obviously this only works for computers and not iPads.
Whoa, awesome idea. Dave is a genius. You'd need 4 coordinates to build a box using a query. Anything outside of these 4 coordinates have left your "geofence".
If you right click on a Bing map it will give you coordinates. If you left click on a Google map to place a pin it will give you coordinates. That should be enough for you to get the 4 coordinates for your box. Only shortcoming is you can only really draw a rectangle aligned with the X and Y axis; it's not possible to have a query work for a diagonally rotated box.