Garmin GHP 20 Marine Autopilot System for Viking Owner's Manual - Page 9

Steering Patterns ‹ Caution You are responsible for the safe operation of your boat. Do not begin a pattern until you are certain that the water is clear of obstacles. The autopilot can steer the boat in preset patterns for fishing, and it can also perform other specialty maneuvers such as U-turns and man-overboard retrieval. You can use the GHC 10 to begin pattern steering. Pattern steering is not based on GPS, and it can be used without a GPS device connected to the autopilot. Zigzag Pattern The zigzag pattern steers the boat from port to starboard and back, over a specified time and angle, across your current heading. Setting Up the Zigzag Pattern You can modify the amplitude and period of the zigzag pattern. The default values are 30° and 1.5 minutes. 1. From the heading screen, select Menu > Pattern Steering > Zigzag > Setup > Zigzag Amplitude. 2. Select or to set the amplitude in increments of 5°. 3. Select Done. 4. Select Setup > Zigzag Period. 5. Select or to set the period. 6. Select Done. Powerboat Autopilot Operation Following the Zigzag Pattern 1. From the heading screen, select Menu > Pattern Steering > Zigzag. 2. Select Engage. The autopilot follows the zigzag pattern, and the heading screen shows the amplitude and period of the zigzag pattern ➊. ➀ TIP: To quickly resume a pattern after you make a heading adjustment with the helm or the soft keys (page 3), select the center soft key twice. GHC 10 Owner's Manual 5