Information please: shooting down of Halifax on the night of 16/17 August, 1944

[Buddio]

Hi: I am trying to find out information about the shooting down of my father's Halifax on the night of 16/17 August, 1944. They were part of 420 Snowy Owl Squadron RCAF stationed at Tholthorpe, England. They had successfully bombed Kiel on their 35 and final mission and did not return. For many years I was told he was shot down by Flak over Kiel; however recently I got my hands on a copy of a letter from the only survivor, the Flight Engineer. At seven minutes after 2, they were shot down; two engines on fire and ditched roughly 70 nm out in the North Sea off the coast of Holland.
I have found several possibilities for the night fighter that got them, and I would like to know first of all, what was the difference in the time the Luftwaffe used and the Canadians used.
Second of all, I would like to find the translations for the map co-ordinates used in the Luftwaffe by NJG 3, as this is the likely squadron.
Thanks in advance
Buddio