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2 GMR 404/406 Owner’s Manual
bAsIc oPerAtIon > understAndIng rAdAr
Before transmission begins, the message “Spinning Up” is shown
while the radar antenna reaches nominal rotation speed. After the
message disappears, the radar begins painting an image.
Understanding the Radar Display
The Radar Page shows a status bar along the top, user-congurable
digital navigation data down the right side, a Heading Line, and
Range Rings. Soft keys that allow quick access to radar functions and
setting changes appear along the bottom of the page.
Range
rings
Heading line
Zoom scale
Ring separation
Soft
keys
Using Range Rings
Use the Range Rings to quickly determine the distance to a target.
The lower-right corner of the screen contains two scales. The top
scale value represents the distance from the center of the radar display
to the outermost complete ring. The bottom scale represents the ring
separation or the distance between the Range Rings. Use the RANGE
keys to zoom in or out. The tick marks on the Range Rings are
arranged with major tick marks at 30 degree increments and minor
tick marks every ve degrees. The tick marks can help in quickly
determining the azimuth to a target.
3/4 nm
1/2 nm
1/4 nm
Heading Line
The Heading Line is shown from your current position along the path
of your current heading.