•Press Gain, then press 1, 5, 0 to set the gain to 150. If you're using standard screen colors, the display will show a green ring with a black center or solid green circle. If it doesn't, try changing the gain value until you can see the green ring and black center clearly. (If the gain is set too high, the display may be saturated.)
•Press Page 3, Page 4, and Install... .
•Press Trigger Delay, then press 000 on the keypad to set the trigger delay to zero.
•Increase the trigger delay by pressing the Cursor Pad to the right (or enter a larger number on the keypad). The black circle will shrink as you increase the trigger delay. Set the trigger delay so that the black center just disappears, with only one or two dots remaining in the center of the display.
Method 2
¾Use this method when the vessel is about 50 to 100 yards (45 to 90
m)from a
•Adjust the gain setting until a reasonably good image of the jetty echo is displayed.
•Adjust the Trigger Delay to make the jetty echo appear as a straight line on the display, as shown:
9.17 Set the heading calibration (heading sensor installed)
The heading calibration rotates the radar image on the screen to line it up with the displayed chart and the compass. Accurate heading calibration is particularly important when the radar image is overlain onto the chart.
Note: Make sure the heading sensor is calibrated according to the manufacturer's recommendations.
•When performing a sea trial of the vessel, set a straight course for a solid object such as a lighthouse, jetty or radar navigation marker that is at least 1 nautical mile distant as referenced on the chart.
•Press CHART to display the chart then press Overlay to show the radar echoes overlain on the chart.
•Set the chart rotation to
•Find a target at least 1 nautical mile distant that appears on both the chart and the radar overlay. Do not choose a beach or a buoy as a target; instead, choose an obvious land pattern or solid object with a fixed reference point such as a jetty, lighthouse, or pier.
•Zoom in as necessary to place identifiable objects near the outer edge of the screen.
•Press Control so that it displays Radar.
•Press Page 2, Page 3, Page 4, and Install... .
•Press Heading Calibrate then press the Cursor Pad left and right to rotate the radar image so that the radar target matches its compass heading on the chart and lines up on top of the position shown on the chart.
•If possible, check targets in all quadrants to ensure accurate adjustment.
