NorthStar 6000i Installation Manual page 34

SECTION FOUR: Setting up the radar (older navigator software)
MANUAL TUNING (Optional — for special situations only)
In the rare event that manual tuning is needed, the following procedure can
be used:
You can judge the echo strength either by observing the percentage return
value displayed below the menu key (the recommended way), or by watching
the dark green echoes on the screen. The percentage shows the fraction of the
screen covered by strong echoes.
Make an adjustment, and wait five seconds before evaluating the change. If
the echo is now stronger, make another adjustment in the same direction. If
weaker, try the other direction. As you get near the peak, make small
adjustments back and forth to find the maximum.
The navigator graphs all of the trial settings in a white box to the left of the
Rough Tune key. You can watch this graph to see a record of the settings you
are trying. Watch for a peak that should begin to form after a dozen or so
trials. The peak indicates the best tuning value. Adjust the tuning value so
that the red bar is at the peak.
Finding a peak should not require more than a minute or two. Little can be
gained by continuing for more time than that.
Setting the Heading Calibration
The heading calibration rotates the radar image to line it up with the displayed chart and the
compass.
28. Make sure the heading sensor is calibrated according to the
manufacturer's instructions.
When sea trialing the vessel, set a straight course for a solid object such as
a lighthouse, jetty, or radar nav marker that is at least 1 nm away as
referenced on the chart.
29. Turn on the radar overlay feature as follows:
• press CHART to display the chart
• press Split and select Chart (full screen)
• press Control to display Control Chart
• press Chart setup
• if necessary, press the Radar Overlay key to turn the overlay on
• press Return
30. Change the chart rotation to North-up by pressing Rotate several times until North up is
displayed.
31. Find an echo that appears on both the radar image and the chart. An appropriate choice
would be a land pattern or solid object about a mile or more from the vessel, with a fixed
point or line, such as a jetty, lighthouse, or pier. (Avoid beaches and buoys as these may have
Page 30 Radar Installation Manual, Rev. E1