MOCA stands for minimum obstruction clearance altitude

MOCA stands for minimum obstruction clearance altitude

• A. MOCA
• B. MSA
• C. MEA
• D. MORA

Answer: (A)

MOCA stands for minimum obstruction clearance altitude. This is the lowest published altitude on an IFR en route segment that ensures obstacle clearance along the route. It also guarantees VOR reception from at least one nav aid within 100 nautical miles of the VOR used. Outside that 100 NM range, you can’t rely on MOCA for navigation signal, though obstacle clearance still applies. This is why MOCA is specifically about guaranteeing obstacle clearance (and limited navigation signal) rather than the broader signal guarantee of MEA, or the other altitudes like MRA, MORA, or MSA.

MOCA stands for minimum obstruction clearance altitude. This is the lowest published altitude on an IFR en route segment that ensures obstacle clearance along the route. It also guarantees VOR reception from at least one nav aid within 100 nautical miles of the VOR used. Outside that 100 NM range, you can’t rely on MOCA for navigation signal, though obstacle clearance still applies. This is why MOCA is specifically about guaranteeing obstacle clearance (and limited navigation signal) rather than the broader signal guarantee of MEA, or the other altitudes like MRA, MORA, or MSA.