Connect Simrad NX40 / NX45, Northstar M84 / M121 | 41
6.3 Set up the radar with the Simrad NX40/45 or Northstar
M84/M121
When the radar is enabled, it will turn on, warm up, and enter standby mode.
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:
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.
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 the boat about 45 to 90 m (50 to 100 yards) away from and parallel to a
straight-walled jetty or similar feature.
• Adjust the gain setting if necessary, so that a reasonably good image of the jetty echo is
displayed on the radar window. At this stage, the jetty echo may appear to be bent.
• Select Zero range then use the arrow keys to adjust the zero range setting until the jetty
echo appears as a straight line on the radar window.
Antenna height
• Select Antenna height then enter the height of the antenna above sea level.
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