II Morrow Inc. 920 GPS - Manual (Page 54)

Parallel Track
With this option, you can set a parallel track
course to a destination. Useful in aviation
applications where busy air corridors may
dictate a parallel track, this option sets the
receiver to navigate a course with a selectable
course deviation distance left or right.
You can select whether or not the receiver will
alert you with the beeper and a message on the
display indicating that this option is in use and
reminding you of the course deviation.
The left or right offset distance you select
represents CDI mid-scale when “Parallel
Track On” is set to “Yes.”
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