From reading the UK's DIVER magazine for 10 years, I've gotten the impression that boats (usually RIBs) are often club equipment in the UK. Also in Norway, Sweden, Finland. As I understood, the OP was talking about a club; many clubs control who participates in their activities regardless of who owns the boat (because the club chartered it).It's not as easy as that. Boats are very rarely (ever?) club equipment, and most members are likely to use their own gear and tanks or tanks provided by the boat. Testing everyone is expensive and will likely lead to riots anyways.
But I think carrots (rewards) are important too; it keeps the mood of the whole thing much more positive. And rules should be those which the club as a group has agreed: it's fair enough to ask a member to comply with what he or she has already agreed.
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