@XS-NRG: Why are you filling in "XTL" in your divelog?
You can certainly deduce an approximate pressure group for a given multi-level dive from your dive computer. If your computer happens to crap out during the surface interval, then you can simply revert to tables for subsequent dives. To figure out the pressure group from a given multi-level dive profile (conducted with your dive computer), use the method I explained in a previous post in this very thread. It's easy to do and doesn't require an expensive proprietary download cable.
Excerpt from Post #89 in this thread...
My example and thinking here actually stems from something I witnessed. In a span of 4 dives in January I watched 3 separate people have computer failures: one smacked onto something and stopped working, one failed to turn on upon entering the water (someone turned the auto-on feature OFF), and the last was a battery failure.
I understand you may have a technique for figuring out a pressure group but I think I'm not understanding it fully. For my working computer I suppose I might be able to figure one out but for the poor soul who's battery died then that trick clearly won't work and really that's all I'm filling the profile section out for. Total loss of functionality whatever the situation. If that happens all I know is where my SPG needle got pushed for my max depth and the time from my dive watch. At that point I have no other information so by writing XTL it's clearly obvious that even using tables for subsequent dives we have a NO-GO for launch. I personally am only interested in filling that section out on the boat between dives so that I know where I stand. If after one dive I'm XTL then I know the rest of the day will follow suit and that at any point if a failure occurs I'm done. It's just a simple way I chose to write it. I could scribble the whole box out if I want, I could color it red, purple or green or I could put a sticker with a skull and cross bones in it. Either way for me I know what it means and it really all equates to the same thing.