fisheyeview:When I travel, or am diving for fun off of a boat that does not know I'm a DM, I don't show my DM card. I just show my AOW. If it's a wreck dive they sometimes will ask for wreck certification. The fewer carsd I have to carry the better.
I get you on the DM card, I rarely show it. I show my Rescue or some other card.
What I have a hard time understanding is your wreck statement and showing a card.
When I dive a wreck I don't show a wreck card.
When I dive My drysuit I have never been asked to show a Drysuit card
If I am taking piictures I don't expect to show an underwater Photography Card
and if I am looking for something I lost I won't show a search and recovery card.
The only card I expect to show when diving other than my rescue is my Nitrox card and that I understand. When I dive I show my rescue card and if they won't let me dive for some reason I find another dive outfit that wants my money. If they want some speciality card they can kiss my butt.