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Forty-seven?
Di
EDIT : Sorry, having re-read the question - several times
are you asking how you work out how deep you are? And how to stop on your stops? And time them? I think the true GUE configuration would have a third team member, so you would use their bottom timer - and if you don't take the third team member, definately take a back-up bottom timer
Or two. And if Murphy should strike thrice in the same place, make sure your safety spool has a wee knot every three metres and practice counting ...................... reeeeeeeeeeaaaaaaaaaal slooooooooooooooooooooow