Very sensitive. A GPS that can be easily repaired indoors, which my portable GPS can't do. Note that the compass output is separate from the GPS output. GPS uses Tx Rx and outputs NMEA sentences. The compass uses I2c and outputs integers proportional to the X,Y,Z magnetic field. The compass output can be converted to direction, but only when the instrument is level. You need an accelerometer to do the equivalent of a compass on a gimbal. Both the compass and GPS work well, but it's better to think of this thing as two devices sharing a common power source than an integrated unit.
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