Garmin gmr 21-41 用户手册

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Gain controls the sensitivity of the Radar receiver. Auto (default) is 

the recommended setting. It automatically adjusts the gain for each 

range scale to provide optimal performance. You can also set gain 

manually. To see more detail, increase the receiver sensitivity by 

selecting a higher gain. If there is too much detail, or the screen is 

cluttered, lower the sensitivity (lower the gain) to increase the clarity 

of the screen.

Sea Clutter controls unwanted screen clutter caused by choppy sea 

conditions. The slider has three preset positions: Calm, Moderate, 

and Rough.

Rain Clutter controls unwanted screen clutter caused by rain at close 

ranges (use the slider to select 1-100%). 

FTC controls unwanted screen clutter caused by rain at a distance. 

The Fast Time Constant settings are: Off, Low, Medium, and High.

Zoom allows you to zoom in on a selected area of the radar screen. 

When you select a zoom range, a window showing a zoomed portion 

of the screen appears in the lower-left corner and a selection box 

appears. To view different areas at the selected zoom range, open the 

Radar adjustment menu, highlight Zoom, and press the Move soft 

key. Use the ROCKER to move the selection box. Zoom has four 

settings: Off, 2x, 4x, and Move. 

Use Target Expansion to increase the size of  targets. Select On or 

Off.

 

 

NOTE: The Target Expansion setting has no effect at range scales 

of 4 nm or greater.