Pilot/Controller Glossary

service in this airspace is delegated to various
countries, based generally upon geographic proximity and the availability of the required resources.
OCEANIC ERROR REPORT- A report filed when
ATC observes an Oceanic Error as defined by FAA
Order 7110.82, Reporting Oceanic Errors.
OCEANIC PUBLISHED ROUTE- 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- An ATS route
established for the purpose of transitioning aircraft
to/from an organized track system.
ODP-
(See OBSTACLE DEPARTURE PROCEDURE.)

OFF COURSE- 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-ROUTE VECTOR- 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- Staggered
runways having centerlines which are parallel.
OFFSHORE/CONTROL AIRSPACE AREA- 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-
(See OUTER FIX TIME.)

OM-
(See OUTER MARKER.)

ON COURSE-
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- 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- The most recent one
minute updated weather broadcast received by a pilot
from an uncontrolled airport ASOS/AWOS.
ONER-
(See OCEANIC NAVIGATIONAL ERROR
REPORT.)

OPERATIONAL-
(See DUE REGARD.)

OPERATIONS SPECIFICATIONS [ICAO]- The
authorizations, conditions and limitations associated
with the air operator certificate and subject to the
conditions in the operations manual.
OPPOSITE DIRECTION AIRCRAFT- Aircraft are
operating in opposite directions when:
a. They are following the same track in reciprocal
directions; or
b. Their tracks are parallel and the aircraft are
flying in reciprocal directions; or
c. Their tracks intersect at an angle of more than
135_.
OPTION APPROACH- An approach requested and
conducted by a pilot which will result in either a
touch-and-go, missed approach, low approach,
stop-and-go, or full stop landing. Pilots should advise
ATC if they decide to remain on the runway, of any
delay in their stop and go, delay clearing the runway,
or are unable to comply with the instruction(s).
(See CLEARED FOR THE OPTION.)
(Refer to AIM.)

ORGANIZED TRACK SYSTEM- A series of ATS
routes which are fixed and charted; i.e., CEP,
NOPAC, or flexible and described by NOTAM; i.e.,
NAT TRACK MESSAGE.