"Everett M. Greene" wrote in message
. ..

Idle curiosity: From whence came the magic 22 nm. number?
The VOR turns into a pumpkin at 22.1 nm?


Can't say for sure, but the 22 knot and 44 knot rules for longitudinal
separation were known as the 25 mph and 50 mph rules before knots and
nautical miles replaced mph and statute miles as standard units for speed
and distance in aviation. I'd bet the magic number for MOCA used to be 25
miles.