The U.S. Department of Commerce requires that all exportable GPS products contain performance limitations so that they cannot be used in a manner that could threaten the security of the United States. The following limitations are implemented on the Trimble Copernicus receiver receiver.
Immediate access to satellite measurements and navigation results is disabled when the receiver’s velocity is computed to be greater than 1000 knots, or its altitude is computed to be above 18,000 meters. The receiver continuously resets until the COCOM situation is cleared.
If the Raveon GPS transponder will be used in aviation applications, the unit should be put into the AIR mode. See the posting “gps-receiver-dynamics” for information about the AIR, LAND< and SEA modes.