Almost every captain will just quietly look at your gear after it's setup and decide if you are new or experienced. If your fins, gloves and wetsuit are all new and shiny with out any scratches (bonus points for leaving the tags still on) then he's going to tell the DM to keep a tight watch on you. If you are diving bullet proof regs, BPW's, kevlar palm gloves, fins so scratched up you can barely make out the logo,,,,,The capt probably figures you won't panic and drown underwater.
On my first trip after I got my own gear. I had 20 logged dives when i arrived to the resort. I had second hanf BP/W that look like new, Old Poseidon Jetstreams paired with A Aqualung Conshelf SEA first stage, and a mix of old and new stuff, i had everything but the tank with me.. i spent the first evening talking diving with the resort manager in the bar. Noone even asked me for a card, but they asked to see everyone elses card.