One would think that three masts up as opposed to two would increase your visual and radar signature by that much more but I doubt SH3 models that. I recall reading that KL Heinz Marbach, a snorkel pioneer from U-953, the boat that Werner would command, kept one lookout on the sky periscope but changed them frequently due to eye fatigue. That's from U-Boats at War by Harald Buch if I recall correctly, one of the first post-war U-Boat books out of Germany in the fifties. I'll have to dig it out and look see, I don't really trust Werner in all things.
If it works for you, carry on by all means. Captain's perogitive after all but lower the TC when snorting and you will probably die less often.
Good Hunting
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