Been on 3 trips in the last 6 months (Florida x2 & Bonaire).
If you can't afford to loose it, don't check it. I don't know what category this puts kids in.
Camera Euipment, computers, masks, and regs are always carried. This only leaves room for toothpaste, snacks and bathing suits in carry-on. What else do you need on a dive vacation? The regs count as the personal item, and everything else gets counted as a carry-on.
When you put your gear through the x-ray machine make sure the operator knows it is SCUBA gear in advance. This generally calms them before something that looks like an overgrown spark plug appears on the screen.
HAND CARRY and HAND CHECK all film, developed or undeveloped. Don't be persauded to let them irradiate the stuff.
Make sure the TSA-Idiots are nice to your gear when they hand search it. Be nice to them, but be firm with them. They have the right to inspect it, but they also have the DUTY to re-pack and not harm any gear. The cost of the camera equipment is more than 2 months pay to them, make them aware of it. I cringe everytime they want me to do more than just pop the pelican case with my camera equipment in it.
BCs, Fins, and Wetsuits could all be rented if the gear was lost or stolen along the way. Some of DAN's plans cover gear replacement and rental costs. AMEX also has supplemental insurance coverage for gear for $9.50 per ticket. Just document what you had to begin with.
Go to RADIO SHACK and pick up the $2.99 pack of multi-colored mini tie wraps product# 278-1676. Your locks will be cut on your luggage if it gets screened after you hand it over (every NYC airport). These tie wraps are not meant to keep people out of your checked bag, but I know in an instant if my bag has been opened. Every trip my carry-ons have been searched without my presence. The TSA replaces the tie-wraps with a white one and includes a little note inside. How many other people in the world will carry flourescent tie wraps when they try to steal from my luggage?
When I see my bags have been gone through I open them again at the airport to see if all of the important stuff is there. If anything would be missing just report it at the Baggage office. So far I have not only not had anything stolen, but another traveling companion came away with an extra set of wire cutters (left by accident by the TSA).