From your perspective in the boat, how do you identify it as a Great White, vs other sharks?
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Sitting in a kayak with adrenalin pumping when anything the size of my kayak approaches me, numbers 1, 3 and 4 might look the same to me, more or less. #2 as well, if I can't see the head. And if the GW is a juvenile in the size range of smaller sharks, I would be less certain.
If we are in a kayak and want to avoid a kayak-sized shark we encounter, what's the procedure? I'm not the kind of guy who wants to pedal in closer for pictures.