Garmin gmr 20 Manuel D’Utilisation

GMR 20/40 O

PERATION

 > 

T

HE

 R

ADAR

 A

DJUSTMENT

 M

ENU

Center Offset—has three settings: Center, Look Ahead, and Auto 

Shift. Center places your current location in the center of the display. 

Look Ahead shifts your current location toward the bottom of the 

display, allowing you to view an area farther ahead. Auto Shift adjusts 

your location on the display according to the current speed.
Rings—is used to turn the radar Range Rings On or Off. 
Background—is used to select a background color for the Radar 

page. The options are Black, Blue, and White. 
Heading Line—is used to turn the Heading Line On or Off.
Bearing Reference—has two settings, Absolute and Relative. 

Relative calculates the bearing relative to own vessel heading. 

Absolute calculates the bearing referring to North. 
Navigation Features—there are three selectable Navigation 

Features: Waypoints, Bearing Line, and Course Line. When selected, 

that feature is displayed on the Radar page.

  • Waypoints—displays user waypoints on the Radar page.
   •  Bearing Line—when selected displays a Bearing Line on the 

Radar page. The Bearing Line is displayed as a line from your 

current position to the active destination waypoint, similar to 

a traditional lollipop.

   •  Course Line—when selected displays a Course Line from 

your starting point to the active destination waypoint, similar 

to navigation on a map.

See MARPA Setup on page 12.

AFC Mode—has two settings, Auto, and Manual. In Auto Mode the 

scanner frequency is automatically adjusted for optimal performance 

and is recommended.