Chapter 7: Using the Radar (Analog) 165
Tune
The tune function is used to fine tune the receiver in the scanner for maximum target
returns on the display.
To Access the Tune Function:
1. Select Menu.
2. Select Radar Setup.
3. Select Scanner Setup.
4. Scroll with the directional pad to select Tune Adjust.
5. Select the Tune button to toggle to Manual, use the rotary control to manually
adjust the tune setting to desired level.
Auto mode
In AUTO mode, the radar tunes itself automatically on all range scales. This is the
default and it is recommended that you leave the TUNE function in
AUTO mode, to ensure that the radar receiver is always tuned to
receive the maximum signal.
Manual (MAN) mode
If you do set the TUNE function to MANUAL, you will need to adjust it about 10 minutes
after you have turned on the radar, since the required setting will change after the
magnetron has warmed up. You should adjust the control to obtain the maximum
signal strength (indicated by the eight step horizontal bar.). If you cannot tune the
radar successfully, refer to the Installation Guide.
7.8 Changing the displayed range
You can zoom in or out to view your radar picture at varying scales. The scale is
measured from the centre to the top of the window and is displayed in the left-hand
corner of the status bar.
The scale you will need is dependent upon where you are navigating and the level of
detail that you wish to see:
• Short range scales - provide greater detail of radar echoes close to the vessel,
and are most suited for use as you approach coastlines, habors or other vessels in
the area. The shortest range scale available is 1/8 nautical miles (or the equivalent
in the chosen unit).
• Long range scales - provide the best overview of the vessel’s relationship to
landmasses, weather fronts and large ship targets in or beyond the field of vision.
The longest range scale available is between 24 and 72 nautical miles (or the equiv-
alent in the chosen unit) depending upon the scanner fitted.
81244_4.book Page 165 Thursday, January 31, 2008 1:53 PM
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