It disbanded and was redesignated a few more times before becoming the Coastal Command Anti U-Boat Devices School.

It operated the Vickers Wellington GR VIII, a British twin-engined, long-range medium bomber, until August 1945 and disbanded at RAF Limavady.

[4] On 28 September, 1942, one of the units Canadian Wellingtons, HX448, went missing on a navigation exercise in the North Atlantic with its crew[a] eventually presumed dead.

[5] A Wellington crashed on uninhabited St Kilda sometime between 1942 and 1943, however, it was never identified and wasn't investigated until 1978 with a RCAF badge being found among the degraded wreckage leading some to assume it was HX448.

[8] It operated with numerous types and variants of aircraft:[3] The OTU was disbanded on 16 May 1944 at RAF Haverfordwest and was immediately redisignated No.

[9] The United States built LORAN navigation system was at that time entering service with RAF Coastal Command.

It operated Vickers Wellington XIII medium bomber aircraft, but was disbanded six months later, on 20 April 1945, to become the Coastal Command Anti U-Boat Devices School RAF.