Hatul
Contributor
Thanks Adam
I looked into the simulator mode on my computer some more. (It doesn't work on desktop software). I was able to simulate a deco dive. Couple things I found
Skipping a deep stop does not increase deco obligation (That is if it is even allowing me to skip it, pressing the button to ascend as quickly as possible but how long it was at the depth is hard to figure out)
There is no warning on upcoming deep stops
Deco obligation still adds up even while ascending until it reaches approx 50 feet. - Yes even if it is done faster then 33ft/min. (ie the little bar on the side comes on, too many bars and it is uncontrolled ascent). Also, scanning the profile of the actual dive in question, it looks like I wasn't going extremely slow. The first bar showed on approx every second point so to me that seems that on average I was going up right around the rate it wanted, so as to not show a fast ascent. Interesting since using V-planner for the same depth, it shows that offgassing starts at approx 90 feet.
If it goes to a stop at 20 feet, I can no longer see how much I will have to do after at 10 feet. However I am able to see how many minutes it has planned to ascend so a little simple math and I get the gist of it.
Deco at 10 feet still does not count down reliably. Ie 12 minutes to clear 10, 25 mins to clear 22. No matter what profile I fooled with it always took longer. Considering that time cleared almost as well at 20 feet why am I trying so hard to be at 10?
You are right. But the things with overhead is that it really is simple. If I do it wrong I can kill or seriously injure myself.
Every single one of my dives here have an overhead environment. The purpose of the dive in question was to explore what my computer does in real world situations.
Thanks for all the help
I wonder if the clearing of the 10 foot deco time has to do with the computer adding a safety stop to the deco time? In my Vyper the Ascent Time in deco mode includes time to ascend to the ceiling (at 33 ft/min) + time at ceiling+ a 3 minute safety stop + time to reach the surface from the safety stop. What you're seeing as the deco time may include all those times, with the largest addition being the 3 minute safety stop.
According to my Suunto manual (which is probably the same for Mares) they recommend doing the 10 foot deco deeper than 13 feet to make sure the waves do not lift you above the 10 foot ceiling. Remember the deco depths are ceiling depths, that you're not allowed to go above. It's OK and desirable to stay below because you're still decompressing, just a little slower. Another explanation for increasing deco at 10 feet is that you went above the 10 foot ceiling and the computer penalized you.
As far as the ascent rate, it may be that your computer if it goes into deco mode expects you to ascend faster than 30 ft min in the deep part of the dive until you start to offgass (the floor).
I wonder why the technical computers don't include a safety stop? It may be that after doing a long deco the extra 3 minutes makes little difference or that the deco times already have that safety margin built into them.
Adam