Position relative to the localizer (if active) or to a course to or from the VOR. The range is -1 to +1, where -1 and +1 are full scale deflections of the needle to either side. Positive values indicate too far left and negative values indicate too far right. The CDI needle displays this value. Returns 0 if the NAV1 radio is not tuned to a station. Measured in signed fractions. Read-only.
Example
IF VOR_2_COURSE_DEVIATION < 0.95
PRINT "The localizer needle is moving, start the turn to the inbound course."
ENDIF