Well if i am correct lets take the Ship Largs Bay, that used to go at approx. 15 Knots So as an example lets say she does 585 Nautical Miles in 1 Day 10 hrs plus Minus! Thats 34 hrs . So if its say plus minus 3 days we can assume approx. 585 + 585 + 480 = 1650 Nautical Miles so would have been past Aden then as the Distance from Port Said to Aden is 1517 Nautical Miles!
Cheers
NB Now of course depending if the Ship kept that same Speed this would be quite spot on, but could possibly have been a bit close towards Port Said if the Ship went a bit slower on occasions !??
So at a guess would say he Died at Sea possibly in the Gulf of Aden then ? This would be just as one enters the Gulf! from the Red Sea.
Hope this may help