However, the question remains ... what exactly is a GUE friendly charter? Charter boats take divers to dive sites, in this instance shipwrecks. What does GUE or TDI or IANTD or PADI or etc, etc have to do with it? You're a diver on a boat getting a ride to a site. What matters to the Capt is if you're qualified to safely dive the site he's taking you to. If you are and if you have money ... than he or she is your biggest fan!
Exactly. GUE does have a strong DIR emphasis which is neither here nor there. I think most charter operators are cash friendly - follow thier directions on thier boat, pay your bill and they are happy campers!