Garmin GPS 400 Pilot's Manual And Reference page 137

Setup 1 Page: CDI Scale / Alarms
To change the CDI scale:
h
a
E
To set the arrival alarm and alarm distance:
h
a
The CDI scale is always measured in nautical miles, regardless of the
current distance units of measure selected on the units/mag var page.
E
a
E
h
a
E
AUX PAGES
Setup 1
7
Œ
Ž
a
Ž
b