Garmin GMR 21 - Manual (Page 8)

4 GMR 21/41 Owner’s Manual
Range Rings
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.
Heading Line
The Heading Line is shown from your current position along the path
of your current heading.
Digital Navigation Data
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.
3/4 nm
1/2 nm
1/4 nm
GMR 21/41 O
PERATION
> R
ANGE
R
INGS
—H
EADING
L
INE
—D
IGITAL
N
AVIGATION
D
ATA