Garmin gmr 21 User Manual

The Range Rings help to quickly determine the distance to a target. In 

the lower-right corner of the display are two scales. The upper scale 

is the current zoom scale. This scale is changed using the 

RANGE 

keys. The zoom scale is represented by the Range Ring with tick 

marks around the circumference. The tick marks are arranged with 

major tick marks at thirty-degree increments and minor tick marks 

every five degrees. The tick marks can help in quickly determining 

the azimuth to a target. The lower scale represents the distance 

between the Range Rings. 

The Heading Line is shown from your current position along the path 

of your current heading.

By default, the Radar Page shows one column of digital navigation 

data with four data fields. The Radar Page can be configured to show 

two columns of data with up to seven data fields each. Each data field 

can be configured to show a variety of data. 

 GMR 21/41 O

PERATION

 > 

R

ANGE

 R

INGS

—H

EADING

 L

INE

—D

IGITAL

 N

AVIGATION

 D

ATA