Suunto "violation"

Dirty-Dog · Nov 9, 2011

In looking through my dive profiles, I notice that I get a "violation" on tne profile during my descent. There's nothing that I know of in SDM that explains what this violation was.
I do tend to descend quickly, since I equalize very easily, but I'm not aware of any limit on the descent rate...

Any clues?

Garrobo · Nov 9, 2011

Same here. I can go upside-down and dive 100' without pausing. For some reason it surpises other divers that I don't need to pause to equalize after about 20', I just swallow or internally blow my nose. I don't worry about it since I've never had any problems after doing this. Also, luckily, my outer ear channels are sloped downward so my ears drain very easily and never have water left in my ears after diving. I've dove with people who have all kinds of problems around these activities.

Reallydg · Nov 9, 2011

It's because the surface interval was not long enough.

Bubbletrubble · Nov 9, 2011

Reallydg is correct. The Diver Attention Symbol can indicate patterns of diving that present higher DCI risk, e.g., multi-day repetitive diving with short surface intervals. I would think that such a symbol could also show up if you are bouncing up and down significantly at shallower depths.

Are you certain that the symbol isn't a "Bookmark" or "Ascent Rate Violation" symbol? If it's an ascent rate violation, is the computer subject to any quick movement upward in the water column?

The following only applies if the symbol turns out to indicate an ascent rate violation...

Depending on where the computer is attached, it's certainly possible that as you swing the computer into your field of view you are moving it upwards in the water column so that the ascent rate sensed by the computer exceeds trigger threshold for an ascent rate violation. Personally, I only experienced one ascent violation during initial descent (in hundreds of dives with my Suunto Mosquito) which occurred due to very choppy/surgey water conditions and me having to help out a buddy who was having ear equalization issues.
Make sure that your descent is deliberate. I have seen some divers who create an upward bounce in the profile of their initial descent because they get too aggressive with adding gas to their BCD.
If your computer is attached to your wrist, I recommend keeping the computer out in front of you during your entire descent. Ensure that the hand to which it is attached isn't moving a lot, e.g., hand used to pinch nose during equalization, hand used to operate the power inflater. If you need to move the computer-attached hand, make sure that the movement is deliberate/slow.
If your computer is attached to a console, keep the console out in front of you for the entire descent. Don't pull it quickly into your field of view. Move it slowly/deliberately.

Reallydg · Nov 9, 2011

Here's a link to this discussion from the archives.

http://www.scubaboard.com/forums/archive/index.php/t-271735.html

Dirty-Dog · Nov 9, 2011

I don't see why the SI would be an issue...
Dive #1: 37 min, max depth 57fsw, avg 46fsw.
SI: 42 min
Dive #2: 41 min, max depth 53fsw, avg 43fsw.

The second dive generates a violation (it's not an ascent warning; the symbols are totally different) on descent.
Even using tables, these are not risky profiles. After the SI, I'd be in PG G according to PADI, and with plenty of NDL for the second dive.

Bubbletrubble · Nov 9, 2011

Dirty-Dog:
I don't see why the SI would be an issue...
Dive #1: 37 min, max depth 57fsw, avg 46fsw.
SI: 42 min
Dive #2: 41 min, max depth 53fsw, avg 43fsw.

"Too short" surface intervals present increased DCI risk.
It can be inferred that your 42 min surface interval (combined with the profile carried out in Dive #1) was judged to be "too short" by the modified RGBM dual-phase deco algorithm employed by the Suunto.

Dirty-Dog:
Even using tables, these are not risky profiles. After the SI, I'd be in PG G according to PADI, and with plenty of NDL for the second dive.

And what kind of deco algorithm is employed by the PADI tables? [Hint: It's not based on RGBM.]
Many divers are under the mistaken impression that, under all circumstances, diving according to tables is always more conservative than diving with a dive computer.

RTee · Nov 9, 2011

DirtyDog...if you look carefully, you will always get that violation on your second or subsequent dive if your surface interval is shorter than one hour... never on the first one. Suunto does not like short surface intervals. I know, one of my computers is a Vyper

Bubbletrubble · Nov 9, 2011

RTee:
DirtyDog...if you look carefully, you will always get that violation on your second or subsequent dive if your surface interval is shorter than one hour... never on the first one. Suunto does not like short surface intervals. I know, one of my computers is a Vyper

@RTee: My experience with Suunto computers (Favor, Mosquito, Gekko, Vyper) is a little different. I've conducted a fair number of repetitive dives with surface intervals shorter than an hour (in the 40 - 55 minute range) which did not result in a "Diver Attention" symbol. I agree that there must be a programmed threshold, but my experience indicates it isn't based solely on being shorter than the one hour timepoint. I'm sure the Suunto algorithm also takes into consideration from previous dives: nitrogen loading, ascent rate violations, see-saw profiles, reverse profiles, etc.

DevonDiver · Nov 9, 2011

Dirty-Dog... can you supply a screen-shot of the dive profile, shown on SDM?

Suunto "violation"

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