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Tornado Terrain-Referenced Navigation (TRN) Unit

Technical Information

Catalogue No: C0857
Category: Navigation/Inertial
Object Type: Signal/Data Processor
Object Name: Tornado Terrain-Referenced Navigation (TRN) Unit
Part No: 53-013-01
Serial No: 016
Manufacturer: GEC Avionics
Division: Combat Aircraft Controls [CACD]
Platform(s): Tornado 
Year of Manufacture: Unknown
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Main Object Store

GEC Avionics Limited
TRN Unit
Part 53-013-01
Ser 016
Code K0656
MRB 230/4972
MRB 230/4973


SPARTAN is a highly accurate, flight proven automatic navigation and terrain following system to enable low level covert operations. The system reduces cockpit workload and greatly improves mission effectiveness.
Under development for over a decade and extensively flight trialled on a variety of low level aircraft, including Tornado, A6E Intruder and F16 AFTI, SPARTAN was selected by the Ministry of Defence (UK) for the RAF's Tornado mid-life update.
The elevation profile of the terrain overflown is measured by a series of covert radar altimeter samples. This profile is compared with an on- board digital terrain database to provide rapid and continuous position fixes Once an accurate navigational position has been achieved,
SPARTAN 'looks ahead' in the database and calculates a mission optimised terrain
following flight path, which can be followed either manually, using the pilot's flight director, or automatically via the aircraft autopilot

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