Hi, On 6 Jul 2015 7:42 am, "Dirk Hohndel" <[email protected]> wrote: > > On Mon, Jul 06, 2015 at 07:03:09AM +1000, Rick Walsh wrote: > > Hi, > > > > On 6 Jul 2015 4:26 am, "Robert C. Helling" <[email protected]> wrote: > > > > > > Hi, > > > > > >> On 05 Jul 2015, at 15:09, Dirk Hohndel <[email protected]> wrote: > > >> > > >> But what I've seen in diver training and in blender training (I'm a > > certified trimix diver and trimix blender) is that you round to the nearest > > foot. Not truncate. > > > > > > > Here people do that, but they also have the big semi-permanent label > > indicating MOD down the side. That is the depth they switch at, which is > > always a normal deco stop depth (multiple of 3m /10ft). 21 m (not 22 m) > > for 50%, etc. And the switch depth in feet is always 0.3 x the switch > > depth in metres. > > > > Serious question: does anyone switch to 50% at 22m? > > So since we in our training style switch while swimming up the slope, we > do tend to switch at the MOD - 20 yes, I have done gas switches at 107ft > :-) > > > For the planner, we need the switch depth, not the true MOD. Maybe we need > > to rename the function to something like gas_switch_depth. Or we can > > create a new function if the current one is used elsewhere. > > We already have an option to only switch gases at required decostops. > Adding an option that limits gas switches to multiples of 10ft/3m seems > silly, but I don't know how people are likely to use things. > > Obviously entering a specific gas switch depth (and using the MOD field > for that) allows any depth a person wants - so yeah, we might rename this > and fill in the MOD by default and tell people to overwrite that if they > want a different depth. > > What do other tech divers think about that? > > > > > > I guess that is the best solution: Round to the nearest meter/foot > > depending on units. Will later send a patch for this. > > > > > > > To calculate switch depth, I'd be tempted to round to nearest metre. Then > > round down to nearest 5m. And finally, do a psuedo conversation of 1ft > > =0.3m to get the imperial gas switch depth. > > So rounding to 5m seems wrong - the typical stop depth are multiples of > 3m/10ft. And as discussed above, I think we should not enforce things that > don't need enforcing.
Gah. Clumbsy phone keyboard typo. I meant 3m. > > > I have work to go to, so won't be sending a patch in the next 12 hr. > > Work on Sunday the 5th... what do you do for a living? Monday morning on this side of the Pacific. Yes, I am from the future. > > /D
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