![]() One other practical difference to keep in mind is that, especially in mountainous areas, you're much more likely to get radar coverage, and have better communcations clarity, at the MEA than the MOCA (I saw this a lot in Idaho). This is why sometimes you see a MOCA on segments which aren't within 22 nmi of any VOR. The MOCA provides "obstacle clearance requirements for the entire route segment," so if the applicable navigation signal is GPS, and you're receiving it, then you've met the requirements. (a) Operation of aircraft at minimum altitudes.ĭown to, but not below, the MOCA, providedĮstimate by the pilot operating the aircraft ![]() However, it should be noted that the 22 nmi is only a limitation if navigating via VOR's.ġ4 CFR - CHAPTER I § 91.177 Minimum altitudes for IFR operations Within 22 nautical miles of the VOR, there is no practical difference between an MEA and a MOCA. If that's true, why is there an 1800 foot difference between the MEA and the MOCA within 22 miles of the PMM VOR on V84? Therefore, when you're within those 22 miles, there's no practical difference between a MEA and a MOCA, right? The only difference in language is the bit about 22 miles from a VOR. (Both quotes taken straight from the Pilot/Controller Glossary) The MEA prescribed for a Federal airway or segment thereof, area navigation low or high route, or other direct route applies to the entire width of the airway, segment, or route between the radio fixes defining the airway, segment, or route. MINIMUM EN ROUTE IFR ALTITUDE (MEA)- The lowest published altitude between radio fixes which assures acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes. 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. As we all know from our instrument training, the MOCA is:
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