Question: Why Is There A Moca In Aviation?

How much clearance does a MOCA give you?


Terrain Elevation Obstacle Clearance
3000 ft – 5000 ft (900 m – 1500 m) 1500 ft (450 m)
Greater than 5000 ft (1500 m) 2000 ft (600 m)

What is Mora and MOCA?

MOCA ensures you obstacle clearance throughout the route but reception only when within 22nm from the navaid defining the route. MORA is a jeppesen derived altitude that ensures you obstacle clearance when within the square.

Is the MOCA higher than the MEA?

2 Answers. You are right. Within 22 nautical miles of the VOR, there is no practical difference between an MEA and a MOCA.

Can you fly at the MOCA?

MOCA’s exist only on airways, so they won’t help off-airways. Ed may be confusing the MOCA with the Off-Route Obstruction Clearance Altitude (OROCA), which provides 1000 feet non-mountainous/2000 feet mountainous clearance within the limits of the lat/long box in which it is located.

What does a MOCA guarantee?

The MOCA is the lowest published altitude in effect between radio fixes on VOR airways, off-airway routes, or route segments that meets obstacle clearance requirements for the entire route segment. This altitude also assures acceptable navigational signal coverage only within 22 NM of a VOR.

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What is the difference between Mora and Oroca?

MORA (minimum off-route altitude). The OROCA (minimum off route obstruction clearance altitude) on the U.S. government’s IFR en route charts serves the same purpose, except clearances are 1,000 feet in non-mountainous areas and 2,000 feet in designated mountainous areas.

What is the difference between MEA and MOCA?

Both the MEA and MOCA provide the same obstruction clearance. The only differ- ence is that radio navigation signal coverage is provided along the entire airway segment at the MEA, but the MOCA provides radio navigation signal coverage only within 22 nautical miles of the VOR.


Define MOCA. MOCA (Minimum Obstacle Clearance Altitude) – Altitude ASL between specified fixes on airways and air routes that meets the IFR obstacle clearance requirements.

Where can I find MOCA?

The MOCA is always at or below the Minimum en route altitude (MEA), and may put an aircraft below air traffic control radar coverage and also below Minimum reception altitude (MRA) for navigation aids; as a result, it is typically used only in emergencies, especially to get below icing.

What does Mora mean in aviation?

Safe Altitude For flights on a non-ATS or random route, the IFR charts are overlaid with a grid indicating the Minimum Off Route Altitude (MORA). The MORA grid is usually presented in blocks measuring 1 degree by 1 degree and a minimum altitude for each block is given in feet with the last two digits omitted.

Can you fly below the MEA?

allow[s] IFR certified Global Navigation Satellite System (GNSS) equipped aircraft to be cleared below published Minimum En Route Altitudes ( MEA )… The notice explained that: For aircraft using VOR, VORTAC or TACAN for navigation, this [i.e., flying at the MOCA] applies only within 22 miles of that NAVAID.

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Where is the minimum IFR altitude?

In a DMA, the minimum altitudes for IFR flight (explicitly defined in 14 CFR §91.177) must be 2,000 feet above the highest obstacle within a horizontal distance of 4 nautical miles from the course to be flown.

What is the minimum reception altitude?

In aviation, minimum reception altitude (MRA) is the lowest altitude on an airway segment where an aircraft can be assured of receiving signals from off-course navigation aids like VOR that define a fix.

What is minimum turning altitude?

Minimum turning altitude (MTA) is a charted altitude providing vertical and lateral obstruction clearance based on turn criteria over certain fixes, NAVAIDs, waypoints, and on charted route segments.

What is minimum instrument altitude?

minimum IFR altitude (MIA) The lowest IFR ( instrument flight rules) altitude established for use in a specific airspace. The minimum IFR altitude provides obstacle clearance but may or may not be within controlled airspace. Minimum altitudes are published on aeronautical charts.

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