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> However I feel there might be a couple of additional differences.  
> Firstly, for this sort of diving over here, there are likely to be 10 or 
> less divers on the boat so there will be between 5 and 10 markers for 
> the skipper to follow.


In practice, it is rare for all divers to come up on deco buoys, normally 
only one pair who get lost, if any.

Having said that, assuming the divers enter the water fairly close 
together (timewise) and have a similar bottom time, they should all send 
up their deco buoys at the same time, and drift along in fairly close 
formation in the tide. Some years ago we did a drift dive on a wreck out 
of Weymouth that is spread out over a very large area (a munitions ship 
which went bang in a big way), in about 55m depth. A time of leaving the 
bottom was agreed, and (pairs of) divers entered the water so as to get 
the bottom time they wanted up to this agreed time. The tide was running 
at about half a knot, which meant that one could drift over a large part 
of the wreck. The system worked fine, everyone came up in quite a compact 
group.


Dave.

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