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Navigation Control Unit (NCU)

Technical Information

Catalogue No: C0044
Category: Navigation/Inertial
Object Type: Control/Data Entry
Object Name: Navigation Control Unit (NCU)
Part No: 25-003-03
Serial No: 253
Manufacturer: Elliott Bros (London) Ltd
Division: Unknown
Platform(s): Jaguar
Year of Manufacture: circa 1975
Dimensions: Width (mm): 186
Height (mm): 113
Depth (mm): 220
Weight (g): 3,153
Location: Triple Shelf Unit, LH (control panels) [Main Store]

N.C.U. (Front)
Type No. 25-003-03
Ref No [NSN] 6JA/6605-99-111-8584
Ser No. 253
Code No K0656
Modification Record 1 to 5
DL Iss 12
Drg 7916-00010 Iss 3
Ser No 259
Control Panel Assy
S.N. 250
DL Iss 10
Mod Record 1, 2 & 3
75 CSK 15820
7500-00054 DL Iss 4
S N. 227
Mod Record 1
MRB 275/40607
EBLR 1/83


The Navigation and Control Unit (NCU) is a small compact unit, complete with its own power supply providing both Control and Display facilities to the navigation system operator. The unit operates in conjunction with the Projected Map Display. The facilities offered include, switch-on, alignment, waypoint setting and selection, fixed and reversionary operation. The NCU also provides readout of navigation data and indication of system malfunction. 12 waypoints can be inserted as well as information such as wind, offsets and heading. 20 quantities can be displayed including latitude, longitude, heading, ground-speed and magnetic variation.

The product is referenced in Company brochures as early as 1970.

In 1967 Elliotts had been awarded a major contract for the design, development and integration of a Navigation and Weapon Aiming Sub-System (NAVWASS) for the RAF's new Jaguar aircraft.

The Jaguar was designed as a close air support aircraft for supporting ground troops in daylight. The NAVWASS enabled the pilot to navigate and fly at low level and high speed to acquire and accurately attack targets. Trials of the prototype Jaguar system were carried out using a Varsity aircraft at West Malling airfield in Kent


The Jaguar NAV/WASS  sub-system comprises four principal groups of equipment. The sensors, which measure what the aircraft is doing and feed these measurements into the computer; the computer sub-system which processes this measured information into a form which can be used by the pilot; the cockpit controls which control the system's mode of operation and lastly, the cockpit displays which show to the pilot the computer's outputs of converted measurement information and also information, such as target or waypoint position, which is being input into the computer. The system included an E3R inertial platform, Digital Computer, a HUD, Projected Map Display, Horizontal Situation Indicator and various cockpit control panels.

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