These units are available to US Government personnel. To provide indoor tracking capabilities for Flying Squirrel, NRL developed a GOTS inertial measurement sensor called Caribou that uses inertial, magnetic and barometric sensors to provide position information in the absence of a GPS signal. Caribou integrates seamlessly with Flying Squirrel, requiring the operator to simply clip the unit to their belt, plug in a USB cable, and pick a starting location.
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