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@Schwob I would at least mark the first 50ft with knots if you plan on doing deco with it. I have the spools attached to my DSMB knotted in 10ft increments to 70ft. Simple overhand knots with 1 knot per 10ft. So 70ft has 7 overhand knots in succession, 60ft has 6, etc. It is a little clunky, but it prevents me from wanting to carry a spare computer or depth gauge for most open water dives since I can control stop depth and ascent rates with those knots.