Yes, well clearly if you're diving from a boat in heavy current and you're not making use of any kind of up-line then you need to get your marker on the surface. There's more involved here than just when to launch the blob, though. On our local wrecks if you didn't use an up-line you'd be lucky if you didn't wash ashore in England because of the currents. With, say, 6-8 divers in the water if everyone just went drifting off the wreck, blob or no blob, then we'd have lost-divers every weekend.
That triggered me because the agreement we have with the skippers here is that everyone uses an up-line that's anchored to the wreck and if a blob gets spotted then it means you're unable to use the up-line for some reason and need to make a non-standard ascent. The point being that if the OP is diving from a boat that the crew should know how he intends to use his blob too.
Just a thought.
R..
That triggered me because the agreement we have with the skippers here is that everyone uses an up-line that's anchored to the wreck and if a blob gets spotted then it means you're unable to use the up-line for some reason and need to make a non-standard ascent. The point being that if the OP is diving from a boat that the crew should know how he intends to use his blob too.
Just a thought.
R..