Thanks guys, that is some good info. I can't stand carrying a thick wallet so I'm a bit obsessive with this. And since I fish from at least three or four different boats in a season, the licence really does need to be on my person or it'll be forgotten on that one occasion when I'm checked.
Along the same wallet-reducing kick, has anyone tried card-storage apps like Stocard or Beep Beep Go? All those loyalty cards for supermarkets, hotel chains, gas stations etc, can be scanned into your smartphone and you no longer need to carry the physical card. I've had Stocard for a few months now and it works well every time I'm asked for Air Miles card and so on. The wallet is down to 5 cards only: business bank card, personal bank card, business credit card, drivers licence and commercial gas card (still uses mag stripe swipe).Now I can sit on my wallet without so much kink in my back I need a weekly chiropractor visit.