Garmin gpsmap 4008 User Manual

Using Radar

Use the Cruising screen to view a full-screen image of the gathered radar information. Your position 

is in the center of the screen, and the rings provide distance measurements.

The zoom scale represents the distance from your position (the center) to the outermost ring. Each 

ring represents an even division of the zoom scale. For example, if the zoom scale is set at three 

kilometers, each ring represents one kilometer from the center out. Use the 

 (+/-) keys 

(GPSMAP 4000 series) or the   and   keys (GPSMAP 5000 series) to adjust the zoom scale.

To access additional settings or options for the radar cruising screen, press 

Gain—controls the sensitivity of the radar receiver. The default setting, 

, adjusts automatically 

to provide optimal performance. Select 

or 

 to manually adjust the gain; select 

 to 

return the gain to the default setting.

Rain Cltr—adjust the gain for unwanted clutter caused by rain at close ranges. Select 

 or 

 to adjust the rain clutter sensitivity.

Sea Cltr—adjust the gain for clutter caused by choppy sea conditions. Select 

 to cycle 

between 

, 

, 

, or 

. Select 

or 

 to manually adjust the sea clutter 

sensitivity.

Guard Zone—defines a safe zone around your boat. An alarm sounds when a detected object enters 

this zone. Select 

 or 

. If the guard zone is on, you can define the boundaries by selecting 

.

(and 

): Use the 

(GPSMAP 4000 series)

as indicated by the arrows 

(  and  ) to define the size of the guard zone. Select 

 or 

 to change the 

reference point. For GPSMAP 5000 series units, touch 

, and then touch the point on the 

screen where you want the first corner of the guard zone. Repeat this with 

.

: Joins the guard zone to completely encompass the boat. Use 

 or 

 to 

adjust the size.

Nav Features—hides or shows distance, arrival time, and bearing when navigating to a destination.