Garmin GXM 40 - Manual (Page 29)

GXM 40 Owner’s Manual 
XM WX Weather Features
Visibility
Visibility is the forecasted maximum horizontal distance that can be seen at the surface. Contour lines on the Visibility
display show the forecasted change in surface visibility. In the example below, visibility ranges from 1 mile to 4.5 miles.
Visibility Contour Lines
This image displays NEXRAD Radar,
Satellite Mosaic, and Visibility.
Displaying multiple features may help to
provide a clearer picture of the weather
conditions in the area.
Visibility Contour Lines
This image displays NEXRAD Radar,
Satellite Mosaic, and Visibility.
Displaying multiple features may help to
provide a clearer picture of the weather
conditions in the area.