service in this airspace is delegated to various
countries, based generally upon geographic proxim-
ity and the availability of the required resources.
OCEANIC ERROR REPORT- A report filed when
ATC observes an Oceanic Error as defined by
FAAO 7110.82, Reporting Oceanic Errors.
OCEANIC PUBLISHED ROUTE- A route estab-
lished in international airspace and charted or
described in flight information publications, such as
Route Charts, DOD Enroute Charts, Chart Supple-
ments, 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
the route centerline.

12/10/15

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/AWSS/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.

(See CLEARED FOR THE OPTION.)
(Refer to AIM.)

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