If my thinking is right then it would be nice to have all dive computers have a SS screen with the data needed to make the decision. replace NDL TTS and other things with GF99 and SURF gff info . perhaps another mode in the computer rec rec adv and tech.
Interesting. You know what I think re GF99 already, and agreed that TTS is useless for Rec divers / divers who don't do deco (compared to Tec where it's vital), but replacing NDL with SurfGF when shallow (and esp when NDL is meaningless - i.e. it displays 99 or infinity
etc ...) is a smart idea. I can't think of any reason why not. At depth, you'd still want both displayed as you can't easily conceptualise how many minutes a GF at that depth is.
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@EFX I've merged your text and think I have it right:
1. 80 ft 26 min, 30 fpm all the way to surface, upon surfacing GF = 90
2. 80 ft 26 min, 30 fpm to 15 ft, 15 fpm from 15 ft to surface, upon surfacing GF = 87, with ss, GF = 85
3. 60 ft at 56 min, 30 fpm all the way to surface, upon surfacing , GF = 97
4. 60 ft at 56 min, 30 fpm to 15 ft, 15 fpm from 15 ft to surface, , GF = 96, with ss, GF = 94
A question, in post 67 above I quoted from another post. Do you numbers match theirs? Their differences seem larger and more depth dependent.
Would you also mind running it for 40m and seeing how it goes?
A second question I've got , is how much 'bang for your buck' (for the above) so you get vs simply heading to the surface and spending an extra 3 min (for 3 min SS) etc there (i.e. the SI duration is a fixed time as they tend to be in the real world). We know the first results (the numerator), but I don't know the surface aspect. I can guesstimate the surface aspect as I have an end-of-dive-delay on my computer, and it looks like 1-2 min GF/min (on the surface, for 20-40 max depth) but I could be wrong ...
just a curious mind