This is a ship's autopilot device that can control the ship's heading through the steering wheel or the key, including heading hold, direction control, and line control functions.
This manual explains how to operate the Garmin GHC™ 20 autopilot, including heading hold, steering modes, and preset patterns like zigzag and circles. It covers both powerboat and sailboat operations, with instructions for enabling features like Shadow Drive™ and Direction Control. Safety warnings emphasize responsible use and avoiding hazards while using autopilot functions.
The manual includes setup steps for adjusting sensitivity, configuring remote controls, and customizing steering increments. It also details how to use GPS-based steering routes and non-GPS patterns such as U-turns and Williamson turns, with specific safety cautions for each.
From the heading screen, select Engage. "Heading Hold" appears in green at the top of the heading screen, and a green icon appears in the upper-right corner of the screen when the device is in heading hold.
Shadow Drive™ is for use only on power planing hull or power displacement hull boats. Select Menu > Setup > User Autopilot Setup > Shadow Drive.
Modify the amplitude and period. Default values are 30° and 1.5 minutes. Select Menu > Pattern Steering > Zigzag > Setup > Zigzag Amplitude to set amplitude, then select Setup > Zigzag Period to set period.