Walk-around of the LRV's control & display console and hand controller.
Picture 2 of 5.
Since the moon lacks a significant magnetic field, an Earth-type compass would
not work. Therefore, the LRV's navigation system used a gyro to determine the
LRV's direction relative to the Lunar Module; another instrument measured the
distance traveled. In this way, the on-board computer could perform dead
reckoning so that the astronauts always knew the shortest route to the Lunar
Module, should it become necessary to make an unscheduled return.
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