I was thinking about that, once i set my gear i dont want anybody touching it, very good point about watching your guage with a couple of deep breaths.
Always do your own essentials check - for the things you really
really need to be OK
You really want to breathe
* Breath both regs
3x times while watching the needle (partially opened or opened then re-closed tank will be detected)
You really want to float/control the float
* Make sure gas goes into your BCD (connect hoses as needed)
* Make sure air comes out from your BCD
drysuit:
* Make sure gas goes into your suit, inflation is noticable (connect hoses
and shut zipper as needed)
* Make sure air comes out from your suit
Other checks, that light works, SMB is in pocket, weight belt is on, etc. are an excellent idea, but less crital than breathing and floating.
Always always always check that you can breath and float.
BTW I nearly ruined a $300 cable light's battery by not having the light properly attached. If I'd just checked that my light worked, as I usually do, this never would have happened.
On a boat, be mindful of how easy it is to fall, esp. with fins on. It's not just your balance, watch for people falling on you, and stuff falling at all times. Just as on dry land/pools, never walk with fins more than absolutely necessary.
Watch that tank: as you walk by with gear on, sitting persons have their heads exactly at the height of your tank bottom.
Do not stand around/linger at the top or bottom of any ladders or stairs. Esp. at the top of the stairs where people are trying to climb onto the boat.
After the briefing, take out your compass and connect what you heard with what you see in the real world. Wouldn't be the 1st time I've stood bewildered at the side of a boat trying to make things fit and someone turned me around 180 degrees and said "
our reef is over there".
The boat ladder may try to kill you at any time. Always expect this no matter how nicely the ladder has behaved in the recent past. It may also try to kill you by throwing divers at you, so stay safely back until it's your turn (and yours alone) on the ladder.
Keep your mask on and reg in until you are on the boat. Falling back in is no sweat if you are already prepared to be underwater again.
Remember to communicate with the folks on the boat. Confirm that you are OK when you go in and immediately confirm that (if) you are OK
any time you surface.