Pilot/Controller Glossary 

4/20/23 

OCEANIC AIRSPACE

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 Airspace over the oceans of the world, considered international airspace, where 

oceanic separation and procedures per the International Civil Aviation Organization are applied. Responsibility 

for the provisions of air traffic control service in this airspace is delegated to various countries, based generally 

upon geographic proximity and the availability of the required resources. 
OCEANIC ERROR REPORT

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 A report filed when ATC observes an Oceanic Error as defined by FAA Order JO 

7210.632, Air Traffic Organization Occurrence Reporting. 
OCEANIC PUBLISHED ROUTE

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 A route established in international airspace and charted or described in 

flight information publications, such as Route Charts, DoD En route Charts, Chart Supplements, NOTAMs, and 

Track Messages. 
OCEANIC TRANSITION ROUTE

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 An ATS route established for the purpose of transitioning aircraft to/from 

an organized track system. 
ODP

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(See OBSTACLE DEPARTURE PROCEDURE.

)

 

OFF COURSE

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 A term used to describe a situation where an aircraft has reported a position fix or is observed 

on radar at a point not on the ATC-approved route of flight. 
OFF

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ROUTE OBSTRUCTION CLEARANCE ALTITUDE (OROCA)

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 A published altitude which provides 

terrain and obstruction clearance with a 1,000 foot buffer in non

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mountainous areas and a 2,000 foot buffer in 

designated mountainous areas within the United States, and a 3,000 foot buffer outside the US ADIZ. These 

altitudes are not assessed for NAVAID signal coverage, air traffic control surveillance, or communications 

coverage, and are published for general situational awareness, flight planning, and in

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flight contingency use. 

OFF-ROUTE VECTOR

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A vector by ATC which takes an aircraft off a previously assigned route. Altitudes 

assigned by ATC during such vectors provide required obstacle clearance. 
OFFSET PARALLEL RUNWAYS

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 Staggered runways having centerlines which are parallel. 

OFFSHORE/CONTROL AIRSPACE AREA

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 That portion of airspace between the U.S. 12 NM limit and the 

oceanic CTA/FIR boundary within which air traffic control is exercised. These areas are established to provide 

air traffic control services. Offshore/Control Airspace Areas may be classified as either Class A airspace or Class 

E airspace. 
OFT

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(See OUTER FIX TIME.) 

OM

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(See OUTER MARKER.) 

ON COURSE

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a. 

Used to indicate that an aircraft is established on the route centerline. 

b. 

Used by ATC to advise a pilot making a radar approach that his/her aircraft is lined up on the final approach 

course. 

(See ON-COURSE INDICATION.) 

ON-COURSE INDICATION

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 An indication on an instrument, which provides the pilot a visual means of 

determining that the aircraft is located on the centerline of a given navigational track, or an indication on a radar 

scope that an aircraft is on a given track. 
ONE-MINUTE WEATHER

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 The most recent one minute updated weather broadcast received by a pilot from 

an uncontrolled airport ASOS/AWOS. 
ONER

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(See OCEANIC NAVIGATIONAL ERROR REPORT.) 

OOP

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(See OPERATIONS OVER PEOPLE.) 

PCG O

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