viktor-sbor:

The Merchant Ship Fighter Unit (MSFU) was a Royal Air Force operational aircraft unit based at RAF Speke, in south Liverpool, {{now Liverpool John Lennon Airport]] during World War II.  The role of the MSFU was to provide pilots, crews, support personnel and aircraft to operate from 35 merchant ships outfitted with a catapult on the bow, referred to as Catapult Aircraft Merchant ships (CAM ships), a stop-gap initiative to provide air support to convoys out of reach of land in the early part of the war when aircraft carriers were scarce.

Fulmars were also deployed as CAM fighters

viktor-sbor:

The Merchant Ship Fighter Unit (MSFU) was a Royal Air Force operational aircraft unit based at RAF Speke, in south Liverpool, {{now Liverpool John Lennon Airport]] during World War II.  The role of the MSFU was to provide pilots, crews, support personnel and aircraft to operate from 35 merchant ships outfitted with a catapult on the bow, referred to as Catapult Aircraft Merchant ships (CAM ships), a stop-gap initiative to provide air support to convoys out of reach of land in the early part of the war when aircraft carriers were scarce.

Fulmars were also deployed as CAM fighters