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SO a MOCA provides ROC along entire route but acceptable VOR nav signal for only 22NM. Why 22NM?

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  • $\begingroup$ Just a comment: 22NM is just a little above 40km. Maybe someone used 40km, converted to nautical miles, and then rounded to the higher number. $\endgroup$
    – jjack
    Mar 9 '18 at 2:49
  • $\begingroup$ Shielding by terrain? $\endgroup$ Mar 9 '18 at 5:52
  • $\begingroup$ Looks suspiciously like 25 statute miles to me, which would be a very typical distance increment back when VORs were first deployed (by 1946, see: en.wikipedia.org/wiki/VHF_omnidirectional_range). $\endgroup$
    – ioctlLR
    Mar 13 '18 at 15:42

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