In April 1942, 222 Group in Ceylon had a number of Catalinas patrolling the Indian Ocean, and their sighting reports on the Japanese task force which attacked the island that month had a real impact on British operations. There is circumstantial evidence that their sighting reports were transmitted on Royal Navy WT nets and not on a RAF net. This seems plausible, since the Catalinas were operating in support of the RN, which had a permanent WT station at Colombo, and I believe that the RAF infrastructure on the island was incomplete and improvised. Can anyone shed any light on this?