Scubapro50,
I'm not trying to give you a hard time here, but you kind of sound like someone who was diving 35 years ago, went into a sleep chamber and just woke up. I mean, these changes didn't just suddenly happen. Unless you've been solo diving in some obscure location, you've known that everyone now uses an octo, that no one buddy breathes anymore. You said:
Have you not made a boat dive in 30 years? Lots of people dive vintage gear, and know full well to call ahead.
I learned to dive in '71 (1st breath on a Voit dbl hose) and there were no computers or octos, and BCs were all the new rage. I like it that I was trained the old way, have upgraded my skills (and gear) and have the best of both worlds.
But alas, I too sometimes pine for the good 'o days...

[ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Yes.. I have made a boat dive recently. The same dive operator (Don Foster in Grand Cayman) ... well one of his divemasters gave me the "need to get new equipment" talk and stress the need to use octs. for safety. The very next day (using Don Foster again) my wife notice our scuba guide on the 100ft tunnel/wall dive at northwest point wasn't wearing an oct. ..... I kept my mouth shut ... I HAVE MADE OVER 500 DIVES .... I currently own a Scubapro MK10 and a Dacor Pacer 900 ............. both are now "vintage" but work great due to good up keep.