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Update Sonar docs.

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Dominic Clifton 2014-10-15 09:32:57 +01:00
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# Sonar
A sonar sensor can be used to measure altitude for use with altitude hold modes.
A sonar sensor can be used to measure altitude for use with BARO and SONAR altitude
hold modes.
The sonar sensor is used instead of the pressure sensor (barometer) at low altitudes.
The sonar sensor is only used when the aircraft inclination angle is small.
The current sensor takes over from the pressure sensor at low altitudes, but only when
the angle of the aircraft is small.
## Hardware