An aerodrome reference point (ARP), in some countries airport reference point, is the ''designated geographical location'' of an aerodrome. The geographic coordinates of an ARP are part of an aerodrome's entry in the

AIP AIP may refer to: Arts, entertainment and media * Action International Pictures * Afghan Islamic Press * AIP Records, a record label * American International Pictures, an independent film production/distribution company, now a subsidiary of MGM ...

. Internationally, the rules governing the establishment of an aerodrome reference point are defined by the

ICAO The International Civil Aviation Organization (ICAO, ) is a specialized agency of the United Nations that coordinates the principles and techniques of international air navigation, and fosters the planning and development of international a ...

in section 2.2 of Annex 14 to the

Convention on International Civil Aviation The Convention on International Civil Aviation, also known as the Chicago Convention, established the International Civil Aviation Organization (ICAO), a specialized agency of the United Nations charged with coordinating international air trave ...

. They state that: In the United States, the term ''airport reference point'' is used and defined as "the approximate

geometric Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is ca ...

center of all usable runway surfaces", computed as a weighted average of the end of runway coordinates.

References

Air navigation {{Airport-stub