1725509 Gunner John Whitter of 7 Battery, 4th Maritime Regiment, Royal Artillery died - presumably at sea - on the 26th February 1942. He has no known grave and is commemorated on the Plymouth Naval Memorial.
At the going down of the sun, and in the morning, WE WILL REMEMBER THEM.
Ancestry.co.uk (1939-1945 Roll of Honour)
Commonwealth War Graves Commission