Trimble Outdoors R7 - Manual (Page 22)

2 Overview
1 0 Trimble R7/R8 GPS Receiver User Guide
Tr
imble R7 Operation
2.4
COCOM Limits
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 R7 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.