Selecting a Speed Source
Select an option:
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If the autopilot CCU is connected to the same NMEA 2000® network as a GPS antenna or a device containing a GPS antenna, select GPS as a speed source.
Garmin® recommends using an external GPS antenna mounted with a clear view of the sky to provide reliable and accurate GPS speed information.
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If a GPS antenna or device is not available as a speed source, select None.
If you select None as the speed source, the autopilot system will perform best when traveling at the speed used during the Autotune procedure.
This setting provides the least-favorable performance, and should only be used if no other speed source is available. If the autopilot does not perform well using None as the speed source, Garmin recommends installing an external GPS antenna to use as the speed source.