Admiralty Pattern 1900M

In Stock1

This gyro compass is ex Australian Navy. The unit is internally lit and has an electric motor for stabilisation.

I am unsure of the voltage, phase and current of the motor so have not powered it up nor opened it.

A sample of this unit is on display at the Royal Greenwich Museum with the description below:

“This gyrocompass repeater has a brass bowl that contains an electric motor for driving the compass card. The bowl is set in gimbals and has two lamp-holder fittings on either side and a card adjustment control at the side. The compass card has a diameter of 8 inches (203 mm) and is divided into degrees, with additional figures printed in reverse for the use of a horizon ring with the repeater. There are also markings at the cardinal and half-cardinal points.
The repeater was originally part of a gyrocompass system used on HMS ‘Triumph’, which was decommissioned in 1981. The repeater would have been linked to a master unit, from which the compass reading came. Gyrocompasses were first successfully developed at the beginning of the 20th century as a solution to the problems of magnetic variation and deviation that are inherent in magnetic compasses. They use the properties of spinning gyroscopes which keep the compass pointing in a fixed direction, usually Earth’s true north. – extract from Royal Greenwich Museum


  • Condition: Used
  • Type: Brass Electric Gyro Stabilised Marine Compass Repeater (2nd)
  • Make: Admiralty Pattern
  • Series: Mark V Gyro Compass
  • Model: 1900-M
  • Serial: 730
  • DOM: circa 1945
  • Diameter: 250mm
  • Bezel: 200mm diameter
  • Construction: Brass
  • Mount: Gimbal
  • Motor: PATT 9298
  • Weight: 11.8kg

Sold AS IS.

Used Admiralty Pattern 1900-M Electric Gyro Compass Repeater ex Royal Australian Navy Circa 1945 For Sale Buy Price