LDM #359: RAF Avro Vulcan Ground Position Indicator - MK.4 - Part 1

This video presents the teardown of a vintage Ground Position Indicator which was used in Avro Vulcan aircrafts. If someone knows something about this device please let me know, particularly the purpose of the various controls on the front panel. 00:00 - Intro 03:54 - Teardown 05:16 - Disk & Ball integrator 07:33 - Latitude and Longitude computations 13:44 - Normal / Fix modes 15:16 - Synchronous motor 16:14 - Test with manual heading change 17:26 - Longitude-latitude simplified electro-mechanical diagram Notes: - At that time the goal of the third disc and ball integrator (on the bottom side) is unknown - The goal of the motor linked to each output differential gear is unknown. I am not sure that they are used for wind correction (unlike in the PHI-4A navigation computer) because the velocity of the shaft of these motors is not controlled. - The Lat/Lon are permuted in the simplified electro-mechanical diagram Latitude/Longitude computation: