Listen to wcollins......Think about this.....
There is a reason why every time I get on a chopper to go to work, winter or summer, I have to wear 3 layers of clothing and an immersion suit (in winter an additional bodysuit too). If the chopper ditches OK and I have to go in the water it is probably the cold that will kill me. I do a 3day offshore survival course every three years and the one thing drummed into you is that cold is a killer - Cold shock and Hypoythermia lead to death.
The North Sea surface water temperature is 2-6°C in winter, 14-17°C in summer.
I am afraid that I am a coward and try not to fly over water unless I can glide to the beach/land.
Regards, SD..
PS. wcollins, you are probably luckier than you think if you had no survival aids at all.