On 10 March 2017 at 19:34, Anton Lundin <[email protected]> wrote: > On 10 March, 2017 - Anton Lundin wrote: > > > On 09 March, 2017 - John Smith wrote: > > > > > I am playing with the planner and have a few questions, hopefully > showing my lack of knowledge rather than bugs [😊] > > > > > > > > > I have 4.6.3.36 running on W10. > > > > > > > > > Firstly, although i have all the ascent rates set to 10m/min, the > ascent rate in the profile window shows 9m/min. > > > > > > > After some testing, i think this is due to that all the spinboxes > > doesn't trigger update on the plan. Try to change the depth or duration > > up and down and the plan will be re-calculated with the right values. > > Nope. It wasn't. I was just a bad tester. > > Its just a artifact of which depths and time steps that the planner > works with. Ex, if you change all the Ascent speeds to 15m/min, the > profile for that dive will be 15m/min. > > The planner tries to match the configured Ascent speeds, but if they > don't align with the depth/time, it errors to the side of caution, and > accents a bit slower. > > > Yes, it is a pretty minor rounding error, but it's worse than it needs to be. The planner works in 2s increments, so ascending at 10m/min means each 3m stop interval should take exactly 18s, but we take 18s to ascend 2.998m (166.66667 mm/s is truncated to 166mm/s rather than rounded to 167mm/s), so add an extra 2s increment, resulting in 10m/min. I just submitted a patch to round the ascent and descent rates when setting the preference.
Cheers, Rick
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