My dive computer just takes an average and it was 79, on all the dives. I could feel cool and warm spots on some dives that was quite extreme, I would guess a five or six degree swing possibly more. Just about everyone would comment on that after the dive and the dive instructors said it was the warmer shallower water coming back out to the deeper cooler water with the falling tide. I had not experienced anything like that on my other warm water dives so it took me by surprise.
The first thing I thought of was my tank.
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