I do think agency matters. If I'm diving with someone with a gue cave cert I know that they met a well defined standard and learned the same procedures that I did. In my mind there's a lot of strength to that. Same gas planning, same hand and light signals, same line management techniques, same responses to emergencies.
There's a whole gue community worldwide and I can (and have) integrated smoothly with divers from all over the world.


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