Communication is key for safe scuba diving. But with the second stage of a regulator in your mouth, it's hard to clearly convey a message to your buddy. That's where hand signals come in. Have you made up your own hand signals with your dive buddy? http://www.sportdiver.com/scuba-diving-hand-signals-every-diver-should-know
Do you consistently run through your gas supply faster than other divers on the boat? Do you frequently have to end the dive before the rest of the group? What's going on? And what can you do about it?
