Charlie99
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For this sort of "don't run me over" type signalling I just wrap 30' of 2mm cord around a 5"x45" orally inflated sausage. It works well for drift dives where you deploy the sausage upon reaching the 15-20' level. A small boltsnap is sufficient weight to pull the line down as I strip it off the sausage. If wound correctly, just the weight of the boltsnap will strip off the line. Then orally inflate the sausage and let it pop to the surface.Freeflyer once bubbled...
I was thinking more for just the 15 safety stop, or to show positioning surfacing near a boat.
The Trident FM35 or similar is sold in a lot of dive shops as a surface signalling device. The Hi-Brite line of cord from the sailing section of a marine store seems to be the least prone to snarling. 3mm is easier to hold onto, but gets a bit bulky. The sausage/cord/boltsnap combo end up being a 5" x 2-1/2" diameter cylinder that easily fits into my BC pocket.
I was initially concerned that the sausage could be overfilled since it doesn't have an overpressure valve, but in practice you can even fully inflate it at 30' and it survives the ascent without bursting.
Charlie
p.s. This isn't an original idea --- it's just an adaption of similar methods used by lots of Cozumel DM's