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8.3 Set up the radar with the Northstar M84 or M121
When the radar is enabled, it will turn on, warm up, and enter standby mode.
¾ To enable the radar functionality:
• Press Setup(NX) or menu twice to display the Setup menu, then select system
• Set Radar to .
• The radar immediately turns on and enters warm-up mode. A message shows how long this
will take.
When the warm-up period is complete, the radar enters standby mode and is ready to transmit.
• Select Installation:
¾ Park position
If your radar has an open array and you take it out of enabled mode, the open array continues to
rotate for a short distance before it finally stops. The stop position is known as the park position.
You can adjust the angle of the parking position so that the open array will always stop at your
preferred position; for example, facing the bow.
• Select Park position then enter the angle of the new park position.
Note:
You may need to try a few different park positions to find the correct one. The strength of
the wind will also affect the park position.
¾ Zero bearing
Use the zero bearing alignment to rotate the radar image, one degree at a time, so that a known
object dead ahead is directly under the boat’s heading marker.
This means that the radar image is aligned with the displayed chart and the compass. An accurate
bearing alignment is particularly important when the radar image is overlaid onto the chart.
Adjust this on a chart window with the radar overlay on.
• Select Zero bearing then use the arrow keys to enter the new bearing angle.
¾ Zero range
The zero range is also known as the radar range offset and as the trigger delay.
If your radar window shows a blank, black circle around the centre or a solid circle of color at the
centre, you need to adjust the zero range setting until this circle disappears or almost disappears.
Ideally, the radar sweep should start at your boat (a radar range of zero).
To adjust the zero range setting:
• Position your boat about 45 to 90 m (50 to 100 yards) away from and parallel to a straight-
walled jetty or similar feature.