Understanding The Cruising Screen - Garmin GPSMAP 4210 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
Distance
between rings
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 miles, each ring represents one mile from the center out. Adjust the zoom scale by using the
RANGE (+/-) keys.
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
between Rough, Med, Calm, or Off. Select
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
the size of the guard zone. Select
• Circular: Joins the guard zone to completely encompass the boat. Use
adjust the size.
Corner 
Nav Features —hides or shows distance, arrival time, and bearing when navigating to a destination.
40
Up or Down
Up
2): Use the ROCKER
as indicated by the arrows (
Corner 1 Corner 2
or
Corner 2
to manually adjust the gain; select
Down
or to manually adjust the sea clutter
to change the reference point.
Corner 1
Circular
GPSMAP 4000 Series Owner's Manual
Zoom scale
Auto to
Up or
Nxt Prset
to cycle
and ) to define
Corner 2
or to