Not sure, are the illegals allowed to keep the satellite navigation devices once they get to a relatively safe haven, or do they have to turn them in for the next wave of illegals?
I bet a few get kept, just for souvenirs, but the officials concerned may get a little stern about wide non-compliance.
It may open up a whole new industry... they can be returned for their Redemption Value.
Kinda like aluminum cans in California.
Can't someone use the same gps signals to locate the illegals with the devices and round them up?