Understanding The Cruising Screen - Garmin GPSMAP 4000 series Owner's Manual

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Understanding the Cruising Screen

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.
Range rings
Heading line
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 using the
keys (GPSMAP 4008/4012) or the
cruising Screen Settings
To access additional settings or options for the radar cruising screen, press MENU.
Gain—controls the sensitivity of the radar receiver. The default setting, Auto, adjusts automatically
to provide optimal performance. Select
return the gain to the default setting.
• Rain Cltr—adjust the gain for unwanted clutter caused by rain at close ranges. Select
Down
to adjust the rain clutter sensitivity.
• Sea Cltr—adjust the gain for clutter caused by choppy sea conditions. Select
cycle between Rough, Med, Calm, or Off. Select
clutter sensitivity.
Guard Zone—defines a safe zone around your boat. An alarm sounds when a detected object enters
this zone. Select On or Off. If the guard zone is on, you can define the boundaries by selecting
Adjust Guard Zone:
• Corner 1 Corner
(and
arrows ( and ) to define the size of the guard zone. Select
change the reference point. For GPSMAP 5008/5012 units, touch
the point on the screen where you want the first corner of the guard zone. Repeat this with
Corner 2.
• Circular: Joins the guard zone to completely encompass the boat. Use
to adjust the size.
Corner 
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and keys (GPSMAP 5008/5012) to adjust the zoom scale.
Up or Down to manually adjust the gain; select
2): Use the ROCKER
(GPSMAP 4008/4012) as indicated by the
Corner 2
Zoom scale
Up Down
or to manually adjust the sea
Corner 1
or
Corner 1, and then touch
Corner 1
Circular
GPSMAP 4000/5000 Series Owner's Manual
®
RANGE
(+/-)
Auto to
Up or
Nxt Prset
to
Corner 2
to
Corner 2
or