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ATC may assign the MOCA when certain special conditions exist, and when within
A.	22 NM of a VOR.
B.	25 NM of a VOR.
C.	30 NM of a VOR.
Pilot Controller Glossary: MINIMUM OBSTRUCTION CLEARANCE ALTITUDE (MOCA)- The lowest published altitude in effect between radio fixes on VOR airways, off-airway routes, or route segments which meets obstacle clearance requirements for the entire route segment and which assures acceptable navigational signal coverage only within 25 statute (22 nautical) miles of a VOR.
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