Performing a master reset on a GHP 10, GHP 12, or GHP 20 Marine Autopilot will return the device to factory defaults. This will require the user to perform both the Dockside and Sea Trial Wizards to use the autopilot.

To perform the master reset, follow the instructions below:

With the autopilot powered OFF, press and hold the Left and Middle Soft Keys of the GHC 10 display of the autopilot
Continue to hold the buttons from the first step and press and hold the Power button
Continue to hold all three buttons until the autopilot fully powers up
Perform the dockside and sea trial wizards Commissioning a Garmin Autopilot GHP 10, GHP 12, GHP Reactor, or Reactor 40 Using a Garmin Chartplotter

NOTE: The master reset procedure will only work when fully powered on. It will not work if the autopilot is coming out of sleep mode.