You start with a basic card certifying you in the type of environment where the majority of your dives are completed as well as the general area or your cert. All should be in the sea not in a quarry. Thus if you qualify at an LDS in the Pacific Northwest and want to go to the Maldives for instance then you need, a further cert for warm water. From the Maldives to say Mexico, then you need and area cert to qualify you for the local conditions and environment.
I like this idea, it also fits into the concept of the Reef Check programme, you get certified for the area that you have studied for. The card should be one card and updated accordingly showing all areas it covers.
I would also suggest keeping the quarry certification, some DMs may never dive anywhere else
I'd also like to see the Master Scuba Diver card changed, from one you can buy (by doing specialities) to one that requires validated logged dives per annum and well as an entry level of dives /time
Thoughts on the above?
That is also a good idea