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OC sidemount I have 2 Shearwater computers. One on each arm. One reads tank pressures from both bottles. On my Choptima CCR I have a Shearwater Nerd2 in my face acting as a controller and another on my arm running in constant PO2 mode. Both the Nerd2 and the arm mounted can display...

I am a techie and have been a tech/cave instructor since 1975. Also, an ex-US Navy diving/salvage officer. So, you can call me old school too. It's nothing to be particularly proud of if you simply stay in that old school room. I have been trusting electronics underwater for 50 years on OC...

@Dr. Doug Ebersole

I use MS-Edge with no issues.

As a US Navy trained recompression chamber operator/supervisor I cannot believe it did. @Duke Dive Medicine what say you?

The dive ops I am familiar with require each diver making a dive deeper than 60 feet to have a dive computer. But...Mexico.....

Unfortunately, you cannot purchase situational awareness. That is the most lacking component in this story.

You are 100% correct. Maybe the CCR Cave instructor covered this material and the OP missed it.

The smart move would have been to just sit out dive #2 because of what happened on dive #1.

This is why I opined that the OP needs to take a CCR cave class from a competent instructor. I am not quite sure exactly what @lostsheep disagrees with me about. I also do not think this is an appropriate venue to be teaching CCR cave gas management. No disrespect to the OP intended.

I think the OP needs to enroll in a CCR cave class with a competent instructor.

These batteries came with my BT Tech 18 months ago or so and work ok for me. No issues at all. I do expect the DeWalts are the better choice, but that's an educated guess only. I routinely get about 5000 feet of run time on these batteries with somewhere around 20% reserve remaining. See my...

I like the NERD on my Choptima - I like not having the wire that comes with the handset controllers.

NSS-CDS standards allow it. Most instructors would prefer you do the 1st half of the course on OC.

Use the STA.

Its a bummer

Agree 100%. It can blow and be cold for days on end so no boat can go out. It can be calm & warm too. The Duval Crawl is a great alternative.

Keep us posted. What a scam.

I vote Rainbow Reef, or Conch Republic for entry level/beginner divers. Rainbow Reef Website Rainbow Reef Trip Advisor

Hydrogen? Sounds like a death wish to me.