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I said mode, not mix. My computer lets me set the mix to whatever it is, but won't let me switch back to "air" once in "nitrox" mode. If I dive air, I set it to 21%. A was led to believe by my instructor that most computers would at least give you the option of defaulting to a safe (albeit...

Air is EANx 21. Most computers require you to put in a mix for each dive after you switch to nitrox mode. You are not permitted to switch between modes. Mine operates on 79 nitrogen, and 50 percent oxygen if I forget. My dive will be short and shallow but I won't get injured.

I am pretty sure that I didn't say any different.

I don't think I would want to dive on a live-aboard that didn't have rental equipmen as a just-in-case.

But may need gauge redundancy to know that it has malfunctioned in the first place.

The Padi manual says it, and people repeat over and over that you should not "blindly trust" a computer, and you should use the tables as a sanity check for what your computer is doing. A disagree...somewhat. It is highly unlikely that a computer will simply start computing the algorithm...

Computers are not more accurate than tables. They are more precise.

Do not even think about following this advice. There is no way you should be recalculating your dive plan in the middle of the dive based on something you may or may not have remembered from a dive table. If your computer craps out, and you don't have a backup, abort the dive. You can...

Lifting the hood away from your ears at the beginning of each dive is just as easy as punching a hole. Just remember to do it near the surface, and not down where the water is 45 degrees or you will defeat the purpose of wearing a hood in the first place.

I probably would have aborted the dive since a have an airtrim BCD, and the oral inflator us a little flimsy, really only for emergencies. I think it is important to point out that you would have thought through the consequences of subsequent equipment failure, and upon realizing that the...

I believe you are correct about the 12 compartments, although the 1 hour compartment is also used for the shallowest dives. However, the RDP can only track one compartment at a time, so it is important to follow all of the table rules as these rules ensure that the RDP is tracking the...

If you get any air trapped in your ears, you can get a squeeze on the outside of your eardrum. It feels like you aren't equalizing even though you are. All you need to do is burp the hood as soon as you get under the surface to let the water on your ears. After that, no problems. I also got...

According to the General Rules section of the RDP, "Plan repetitive dives so each successive dive is to a shallower in depth" The RDP tracks two tissue compartments when you do deep dives, and follow them with repetitive dives. The first is the controlling compartment for the first dive. The...

What dive insurance requires aow to pay out if you have an accident at 100 ft? I believe dive operator insurance may have these clauses, but I haven't seen a personal policy with this.

I noticed you were using computers. Had you said you were using the RDP, caution would probably be advisable as the RDP calculations for multiple dives assume that you are doing your deepest dives first. Your computer, on the other hand is essentially creating the table as you go.

Thirds takes into account sac rates. Example (assuming same size cylinders). Diver A starts with 1800 psi. Diver B 3000. Use 1800 for rule of thirds. Diver B breaths twice as fast as Diver A. Diver B has 2400 PSI at the turnaround, and Diver A has 1500. Diver B has a total air supply...

In high current, where the only way you are getting back to the boat is up the anchor line, thirds (or half way to rock bottom) is required to ensure that you don't end up on an unintended drift dive.

This is a flame free forumn so my desired comment must be left unwritten.

Interesting how those who use the necklace, usually agree that they wouldn't want it any other way regardless of how they use it (as primary or secondary), yet it never seems to get promoted in OW courses.

I love the sound of my bubbles. When I snorkel, I usually breath out my nose just so I can hear the bubbles.