II Morrow Inc. 920 GPS - Manual (Page 53)

of an airspace you are flying over is 4,000
feet, an airspace message (if selected) occurs
when the GPS altitude is at or below 5,000
feet.
CDI Scale
This option controls operation of the course
deviation alert and allows you to set the CDI
scale units to your preference.
You can select the CDI scale maximum course
deviation left or right.
The “Alert Message” controls whether or not the
receiver will alert you with the beeper and a
message on the display indicating a course deviation
left or right in excess of the value on the scale.
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