Shearwater
Contributor
It is the latter. Stops disappear during the hover below stop.
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So, if using 30/70 can I surface at a gf of 60 without having had a ceiling at any point? Is that an NDL dive in the planner?Correct. GF low is only relevant for dives that require mandatory decompression stops.
Why would you not get an initial stop when you hit a gf of 30?Yes, that is possible and yes, it would be an NDL dive.
Yes, that is possible and yes, it would be an NDL dive.
That's interesting. So you use GFhigh to determine NDL time, and start deco calculation with GFlow only after NDL time is over? That would cause some weird effect in a dive computer: just a second after NDL time is over, suddenly a long deco plan is displayed with many stops, starting at a depth below your current depth (if you've already ascended to a shallower place and GFlow is small); the diver immediately violates the deco plan and has to descend to his first stop.
So, the NDL times in the planner and in the dive computer are different for the same GF settings?
You ascend t until you get to the GF low condition and that is your first stop.Well now that is interesting. Is your first stop calculated such that your tissues are 30% of the M value when you begin hovering at depth, or do you ascend to your first stop once your tissues are 30%? From the graph I would say the latter.
Don't you mean you descend from ambient?
That's interesting. So you use GFhigh to determine NDL time, and start deco calculation with GFlow only after NDL time is over? That would cause some weird effect in a dive computer: just a second after NDL time is over, suddenly a long deco plan is displayed with many stops, starting at a depth below your current depth (if you've already ascended to a shallower place and GFlow is small); the diver immediately violates the deco plan and has to descend to his first stop.
So, the NDL times in the planner and in the dive computer are different for the same GF settings?