Sue Ė more for you. Digging deeper into my fatherís notes I found a photocopy of a genealogy prepared by Paul Bridson, the antiquarian and perhaps the father of Manx genealogy . Among the children of William Bridson (d.1799) and Ann (d.1812) he gives:
John baptised Sept 25 1782
married Catherine Whitnam (?)
of the cou[nty] of Cor[nwa]ll (Launceston)
and had several children
including Ann & Mary
who all died young &
unmarried. He died
at sea on his voyage
from Jamaica & was
consigned to the deep in (margin Ė Gulf of Mexico)
August 18: 1816 His widow died in 1849
and buried at St Georges in Douglas.
I donít know what sources Paul Bridson used but this John was his uncle so he should have known. It makes me wonder whether this source is fully used by searchers.