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Hello all. I currently have a Shearwater AI and a non-tech backup computer that I want to replace. My dilemma is that I want to purchase a computer that will work with the Kiss Sidewinder bacause i plan to purchase one next year. I was considering a NERD with four pin connector but I am...

At your level you can do a guided cavern dive. The cenotes are tightly controlled and they only let qualified and registered guides bring open water divers into the cenotes. There are plenty of shops that do guided dives like that. You will usually get two dives for a reasonable cost. Water will...

I second this!!! Focus on learning and mastering skills and the certifications will come when you get there. They will let you complete a portion of a course and come back another time to pick up where you left off too, so you don't have to feel time stressed. Under the Jungle has an extremely...

You will need to take intro to tech (sidemount or doubles), cavern, intro to cave, and full cave. Any legit school will require you to reach a certain level of proficiency in each of those certifications before letting you move to the next class. This doesn't just mean passing the class. For...

I am just repeating what the manufacturer is saying. Their seat saving orifice retracts away from the seat when not pressurized which prevents damage during storage. This is a unique Atomic design and because of this open seal, the manufacturer warns not to submerge the regulator when...

Thank you for the thoughtful reply.

Thank you for your reply Jim Lapenta!

Thank you for the reply Wibble. The manufacturer is the one warning to never allow the regulator to be submerged when not pressurized.

Thanks for your reply girlwithbigtanks. Yes my concern is with what could happen by violating the manufacturer's warning about having the regulator submerged while not pressurized.

Thank you for the reply rjack321. It was not my intention to fully describe the valve drill, i am intimately familiar with the procedures. My concern is that the manufacturer warns that the regulator cannot be submerged unless pressurized. This is definately a negative selling point and a reason...

Thank you Rol diy. I hadn't considered that!

Yes. My concern is getting water into my first stage during freeflow drills.

I am trying to decide between the Atomic M1 and Scubapro MK25 EVO/A700 regulators and I was leaning towards Atomic until I realized the seat saving design prevents submerging the second stage unless it is pressurized. I'm not concerned about cleaning but when I was taught how to handle a major...

I have a transmitter on each tank but the Perdix gives the SAC rate only for one of the tanks "T1."

Thank you for the info. I will check Subsurface out.

Thank you for the response. I understand what you are saying, and I am pretty sure I have a clear understanding of what and how the calculations are done with the Perdix. As far as the real time, last two minutes SAC rate, I'm not interested in that in this context. Shearwater shows your real...

Shearwater doesn't show how to calculate RMV (volume SAC) for sidemount doubles. Their method uses the pressure drop of one cylinder along with the time for the total dive (half of which you are not breathing from that cylinder). The result is a rate that is about half of what it actually was...

I'm just looking to collect as accurate a RMV as possible to be aware of differences in rate for different types of dives, as well as identifying any trends or changes in rate. It's also useful for dive planning. Knowing how far I can go on a fixed volume of gas for a certain type of dive, or...

Hello all. I a trying to calculate my RMV using the SAC rate calculated on my Shearwater Perdix AI. I'm hoping that someone who is better versed in this than I am can verify that either my reasoning and math is correct, or I am missing something. The problem is that I dive sidemount doubles but...