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I can't speak to the proprietary algorithms, but anything with gradient factors will have a fairly consistent tissue supersaturation, because that's at the heart of the algorithm. Conceptually, I believe even the proprietary ones will act similarly, as that's the entire point (limiting the...

This results in a variable safety margin that is dependent on the mix. I believe it is better to use the conservatism features of the computer with the actual inspired gas.

A critical distinction is my wicking layer was about $15 USD. But hey, if you want the J2, go for it. I don't doubt it will be warmer if you need that

I have a cheap wicking layer from Amazon that I use regardless. It takes the brunt of the body odor, and I don't need to wash the fancy fabrics during a trip. Wicking+Xero, wicking+Arctic, or wicking+Xero+Arctic. One trip with just the wicking layer in 27°C water was just fine. I had to go up a...

+1. I took a tank one day to a pool and measured how much lead it took to be neutral with the drysuit in the various undergarments when in horizontal trim just at the point the valve exhausts. I can easily mix & match my gear because I keep a list of the component buoyancies (backplate, doubles...

As you're probably aware, temperature tolerance is quite personal. One data point: I can use Xerotherms down to 16°C for 30-45 min NDL dives. If I'm doing deco or longer or colder, down to 9-10°C, I'll use the Arctics. Colder than that and I use them both (down to 4°C on some NDL dives).

Define "very negative". A diver in a drysuit should be neutral with near empty tanks/wing just as a wetsuit diver should be at the safety stop. This leaves just the gas weight prior to that (or often less, see below). As to your initial concern, a negative buoyancy of 12 lbs is not much at all...

Sounds too small. However, the shopping bag trick is helpful for getting things over the hands & feet. One important question is whether this suit is lined (closed-cell neoprene) on un-lined (open-cell). The latter needs a lubricant of some type (watered-down hair conditioner is common).

You may like to read this thread for a related discussion: https://www.scubaboard.com/community/threads/ascent-to-altitude-from-santa-rosa.526134/

Yes, there's definitely more to it than the pressure change or rate of change. Even flying (equivalent to 8000 ft) is only a reduction of 26 kPa, which is also less than the ascent from 15 ft. If you're familiar with gradient factors used by many dive computers, we regard a surfacing GF of 75%...

I suspect that will be doable. With an equivalent depth of 38 fsw on the night dive, there's a fair bit of room before exceeding Group K.

The conservative approach is to ignore the fact you first descended from altitude. After being at sea level all day, any slight advantage you would have had coming from altitude is gone from the tissue compartments that will control a recreational dive.

This has the drawback of no exit indication for the lead diver in the case of separation. I guess they could move the line off their REM, but would that be confusing to the rest of the team? That could also allow a slack line/entanglement hazard in some cases if the end could then slide. Same...

I'd say that a cookie on the wrong side is even more difficult to spot. At least with counter-indications with a REM, you have an indication that something is amiss and can take a moment to consciously think, verify with the team, look at the cave, etc. It takes two mistakes to achieve the...

I remove the batteries from my Palm for that very reason, and I install the battery before leaving on the trip. Stupid screws! The lithium option sounds like a better approach. I have a Solo for my normal use and tech trips. The Palm only goes on recreational trips because I don't mind when it...

But why would anyone ever place it on the wrong side at all?

It estimates during the dive based on the compass/accelerometers but then corrects everything after surfacing, based on the final GPS fix.

Tip on the new planner -- if you have the Dark Theme in the overall settings, you can't see numbers in the planner (depth, gas, etc.). Blue Theme works. I'm so glad this has been added.

Yep, one of my favorite tips. Thanks @Umuntu!

Crucially, Steps 3 and 4. 🤣 J/k, fold the end of the belt back on itself and run it through the inner tube. Then pull the tubing across the rear pouch webbing as you return the belt to the normal orientation (running straight through the pouch).