Raymarine Marine GPS System User Manual download pdf (Page 104)

Advanced Navigator Functions

5-13

Radar Gain Control

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.

The Gain control can be set either to Auto or Manual modes.

In Auto mode, the Pathfinder Plus radar optimizes the setting.

In harbors or close proximity to land different auto settings may

be necessary to cater for the effects of land clutter.

Alternatively, set both Sea Clutter and Gain to Manual mode, and then

adjust the settings to ensure that all close small targets are visible.

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. On shorter ranges, you may wish to reduce the gain slightly to

reduce the speckle and therefore improve target definition. Do not set

the gain too low, or you may miss small or weak targets. The new

Gain mode (auto or manual) and values are also retained each time

you turn the radar off or on.

Note: Gain can only be adjusted if the control is set to

Manual adjustment. Because the SEA control affects

the gain, you may need to manually readjust it if you

manually change the Gain setting.

To adjust the Gain:

1. Select a range appropriate to the adjustment you want to

make.

2. From the Pathfinder Panel, click the GAIN button.

The Gain Functionbar buttons are displayed.

Click the right mouse button and select View/Control

Panel. The Control Panel appears.

3. Click the GAIN Functionbar button . The button toggles

the control between Auto and Manual mode.

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Raymarine Marine GPS System User Manual Page 104