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NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum18
Heading line
The heading line is a white line that extends
from your boat to the edge of the radar
window.
Show the heading line.
Hide the heading line.
Setup > Radar > Installation
Note: This option is shown only when the
radar is enabled (see Manual, 18-3)
1 Press
twice to display the Setup
menu, then select
Radar.
2 Select
Installation:
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.
1 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.
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.
1 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:
1 Position your boat about 45 to 90 m (50
to 100 yards) away from and parallel to a
straight-walled jetty or similar feature.
2 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.
3 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
The Installation Manual for your NAVMAN
radar explains how to find the optimum
height for your radar scanner (antenna).
Select Antenna height then enter the height of
the antenna above sea level.