Raymarine SL72, Owner'S Handbook Manual

Page: 73 / 243

3-8 SL72 & SL72RC PLUS Pathfinder Radar & Radar/Chartplotter
A
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stin
g G
ain
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ain
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une
4. Use the trackpad to move the slider up or down. You can press and hold the
control to move the slider quickly rather than in single steps.
The image on the screen changes as you move the slider, so that you can see
the effect of your adjustment.
If you select
MANUAL TUNE
adjustment, an 8-step signal-strength indicator
bar is displayed above the slider. Adjust the slider to obtain the maximum
reading on the indicator.
Note: Because the changes to the settings are made immediately, you cannot
revert to the previous setting by pressing
CLEAR
.
5. When you have set all the controls to the levels you require, press
ENTER
,
or CLEAR to clear the slider display. The status bar is updated to indicate
which controls are switched to Auto or On.
Gain Control and Sea Control
The
GAIN
control can be set to either Auto or Manual. In Auto mode, the
Pathfinder Plus radar optimizes the setting. The SEA control can be set to Auto-
Harbour (default), Auto-Offshore or Manual mode. In Auto-Offshore mode,
the Pathfinder Plus Radar optimizes its settings to account for the effects of sea
clutter.
In harbours or close proximity to land different auto settings may
be necessary to cater for the effects of land clutter. To avoid losing small
targets it is therefore advisable to set the Sea control to Auto-Harbour
mode. Alternatively, set both Sea and Gain to Manual mode then adjust
the settings to ensure that all close small targets are visible.
The
GAIN
control adjusts the level of the display of signals received from the
scanner; it is equivalent to a volume control on a radio.
Because the
SEA
control affects the gain, you may need to manually readjust it
if you manually change the Gain setting.
Gain Control
When the GAIN control is set to Manual, you should check it every time you
change the range scale.
On long range settings, the gain should be set to give a slight speckle in the
background of the radar picture. Do not set the gain too low, or you may miss
small or weak targets.
On shorter ranges, you may wish to reduce the gain slightly to reduce the
speckle and therefore improve target definition.
MANUAL
GAIN
50%