42 ST70+ User Reference ManualStarting open water calibrationIf the SeaTrial calibration page is not displayed,used the following procedure to gain access:1. Use the Select Display button on an appropri-ate Pilot Controller keypad, to select the PilotController you want to use to carry out the auto-pilot open water setup procedures.2. At the appropriate Pilot Controller keypad,press MENU to display the Main menu page.3. Scroll to Autopilot calibration then press OK todisplay the Autopilot calibration menu.4. Scroll to select Commissioning, then press OK to display the Commissioningmenu.5. Scroll to select SeaTrial Wizard , then press OK, to display the SeaTrial calibrationstart page.6. Press OK. to display a Warning page.7. Press OK to display the Swing compass page, then start the Compass calibrationprocedure.Compass calibrationThe compass calibration procedures are:• Swinging the compass.• Aligning the compass.Swinging the compassThe magnetic deviation correction procedure (commonly called “swinging thecompass”) involves turning your boat in slow circles so the autopilot can automaticallydetermine the deviation and apply any correction required. The correction procedurereduces deviation errors to a few degrees.As magnetic deviation can cause significant compass errors on your boat, you MUSTcomplete the compass swing before any other seatrial procedure.To swing the compass, ensure the Swing compass page is displayed, then when youare ready to turn the boat:1. Press OK and begin to SLOWLY turn the boatin circles (keeping the boat’s speed below2 knots).• Take at least 2 minutes to complete each360°.• Complete at least two circles.If you turn the boat too quickly, the display willshow a Slow down message. If this occurs,apply less helm to turn in a larger circle.D11187-1Press OK to continueSea Trial calibrationBefore you can use yourautopilot you need to dosome open water checks.The water must be calmwith light wind.Leave plenty of room tomaneuver.Press CANCEL to exitwithout savingiD11188-1Press OK to startSwing CompassMove in a slow circle.Press CANCEL to exit.