I dive in two quite different sets of circumstances - in the UK as part of a sub acqua club where we plan, organise and lead all our own dives. We have our own RHIB but also hire day boats for the club. We do boat dves all round the UK coast, for example last weekend we were off the south coast near the Isle of Wight, in two weeks time we will be 300 miles north off the east coast of Scotland. When we have club dives whether from the RHIB or hard boat we plan, lead and manage our own dives, we never have a local DM.
I also dive each month when at work in the Mediteranean where I use a local dive centre or shop. I have a regular dive partner who works with me and the LDS we normally use know us now so they are happy to let us dive alone as a buddy pair, either from the shore or from their boats, but all other divers are accompanied by a DM from the centre.
We have often gone along with the groups and just done our own thing, but we have frequently looked on in disgust as so called qualified divers who have obviously not dived in a long time, but think they are better than they are, have had significant issues under the water. Poor bouyancy, poor finning and so on, I have watched one actually undo his weight belt whilst trying to adjust his BCD at depth (about 100 foot). That was a tragedy only just averted because his buddy realised what he had done and managed to grab it and him before he could let go of it and after a lot of effort between them to refasten it.
My point is that when kitting up these people are invariably full of what they have done, and what cards they have, and so on, but despite this they are not diving regularly and are very rusty. I think it is entirely reasonable to expect either an easy first dive as a shakedown, or a sensible refresher before diving with someone you don't know. Otherwise at best you are risking a ruined dive for the other people because too much time and effort is taken over sorting out a rusty diver, and at worst you have a tragedy on your hands.
I wouldn't consider diving a 30m (100 ft) dive site with someone I hadn't dived with before unless they came with a personal recommendation from someone I knew and trusted. That is how our club works it doesn't matter what qualifications you have, you get checked out by the dving officer before you can join club dives and if you are not current you have to have a shakedown dive first.
I know I would feel slighted if someone said to me they didn't want to accept my qualifications at face value - it happened to me (and I did feel pissed) when I joined my club last year, but overall I would rather know that everyone was in the same boat - so to speak- and that their skills had been verified and were current.
This must be much harder for guides and LDS centres especially those catering for 'tourist' divers but as I see it you have two options. Either keep your dives so simple you are unlikely to have a problem, or require a verified recent dive history or refresher/check out before going deeper or beyond absolute basic.
I know that as a regular (at least at the moment) diver this will not catch me too often, but if I had to do a checkout dive I would happily do so, but I think it is important to plan your diving - and that planning starts long before you arrive on holiday or at the LDS. If you need a refresher schedule it in early before you go.
---------- Post added May 4th, 2012 at 08:12 PM ----------
I have just come across a link to a report about some DAN research on another thread - What more eloquent arguement could you want than this - a quote from Dan Orr, President of the Divers Alert Network on their analysis of deaths from over a 1,000 diving incidents they analysed;
"Of the total number of dive fatalities analysed, 88 per cent were on the first dive of their vacation or trip. "
I think that says it all about the need for refreshers and check out dives.
P