TERPROM is a military navigation Ground Proximity Warning System (GPWS) employed on aircraft and missiles, which uses stored digital elevation data combined with navigation system and radar altimeter inputs to compute the location of an aircraft or missile above the surface of the earth. It is also used as a warning system to prevent aircraft from flying too close to the ground.

TERPROM was initially conceived in 1977 within the Bristol based Guided Weapons New Projects Office of British Aerospace as part of a MoD funded contract to advise the Government on the development options and applications of tactical cruise missiles.

TERPROM (R) utilises Terrain Reference Navigation to provide aircraft with a Predictive Ground Collision Avoidance System (PGCAS)as well as Obstruction Warning and Cueing (OWC)

TERPROM is produced by Atlantic Inertial Systems, Plymouth UK, formerly a subsidiary of BAE Systems
BAE Systems
BAE Systems plc is a British multinational defence, security and aerospace company headquartered in London, United Kingdom, that has global interests, particularly in North America through its subsidiary BAE Systems Inc. BAE is among the world's largest military contractors; in 2009 it was the...

. Acquired in Dec 2009 by Goodrich Corporation.

TERPROM is operational on the following aircraft:
  • F-16, Mirage 2000, Harrier
    RAF Harrier II
    The British Aerospace/McDonnell Douglas Harrier II is a second-generation vertical/short takeoff and landing jet aircraft used previously by the Royal Air Force and, between 2006–2010, the Royal Navy. Derived from the McDonnell Douglas AV-8B Harrier II, which was a development of the Hawker...

    , SEPECAT Jaguar
    SEPECAT Jaguar
    The SEPECAT Jaguar is an Anglo-French jet ground attack aircraft, originally used by the British Royal Air Force and the French Armée de l'Air in the close air support and nuclear strike role, and still in service with several export customers, notably the Indian Air Force and the Royal Air Force...

    , Panavia Tornado
    Panavia Tornado
    The Panavia Tornado is a family of twin-engine, variable-sweep wing combat aircraft, which was jointly developed and manufactured by the United Kingdom, West Germany and Italy...

    , A-10
    A-10 Thunderbolt II
    The Fairchild Republic A-10 Thunderbolt II is an American single-seat, twin-engine, straight-wing jet aircraft developed by Fairchild-Republic in the early 1970s. The A-10 was designed for a United States Air Force requirement to provide close air support for ground forces by attacking tanks,...

    , Eurofighter Typhoon
    Eurofighter Typhoon
    The Eurofighter Typhoon is a twin-engine, canard-delta wing, multirole combat aircraft, designed and built by a consortium of three companies: EADS, Alenia Aeronautica and BAE Systems; working through a holding company, Eurofighter GmbH, which was formed in 1986...

    , BAE Hawk
    BAE Hawk
    The BAE Systems Hawk is a British single-engine, advanced jet trainer aircraft. It first flew in 1974 as the Hawker Siddeley Hawk. The Hawk is used by the Royal Air Force, and other air forces, as either a trainer or a low-cost combat aircraft...

     C-130 and C-17 aircraft
  • Storm Shadow
    Storm Shadow
    Storm Shadow is a British, French and Italian air-launched cruise missile, manufactured by MBDA. Storm Shadow is the British name for the weapon; in French service it is called SCALP EG...

    cruise missile

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