Suunto Vyper "Dive Attention Symbol"

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Mark - 12 Oct 2006 00:24 GMT

I have dived tables for 10 years and just bought a Suunto Vyper dive
computer. I am confused re: the Dive Attention symbol. I have read
these groups and the comments. I have gotten this symbol and have not
violated the ascent rate. I will avoid any 'saw tooth' dives and see if
this makes a difference.

However, the manual suggest to "extend my surface interval". I cannot
find a suggested surface interval or desat time. The no-fly time is
always a least 12 hours so this does not help in planning a surface
interval before dive #2.

So my question, for you Suunto Vyper owners that have figured this out,
is 1) how do a calculate a minimum or reasonable surface interval with
the computer, and 2) when I do get a Dive Attention symbol, how long
should I 'extend' my normal surface interval to?

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Dirk Macke - 12 Oct 2006 09:03 GMT

> So my question, for you Suunto Vyper owners that have figured this out,
> is 1) how do a calculate a minimum or reasonable surface interval with
> the computer,

There is no 'feasible' way to do this. You can achieve this by playing
with the planner and compare resulting no-stop times, but that's rather
tedious.

> and 2) when I do get a Dive Attention symbol, how long
> should I 'extend' my normal surface interval to?

You will always get the attention symbol, regardless of the dive. It
reminds you to follow the recommendation to have a surface interval of
at least 2hs (the symbol will disappear after 2hs surface interval).
That's based on the assumption (or better: on doppler results), that
bubble formation rate hits its maximum after 1h, and decreases
significantly within 2hs after the dive.

HTH,
Dirk

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Keith Manning - 12 Oct 2006 10:07 GMT

>> and 2) when I do get a Dive Attention symbol, how long
>> should I 'extend' my normal surface interval to?
[quoted text clipped - 5 lines]
> formation rate hits its maximum after 1h, and decreases significantly
> within 2hs after the dive.

On my Geeko, the attention symbol dosen't appear on shallow dives (<10m)
unless you violate ascent rates or bob up and down a lot. Between 10m - 20m,
it goes away after 1hr surface interval and deeper than 20m it takes 2
hours, again it is prolonged if ascent rates are high or a saftey stop is
missed.

Keith

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Ken - 12 Oct 2006 14:14 GMT

>I have dived tables for 10 years and just bought a Suunto Vyper dive
> computer. I am confused re: the Dive Attention symbol. I have read
[quoted text clipped - 11 lines]
> the computer, and 2) when I do get a Dive Attention symbol, how long
> should I 'extend' my normal surface interval to?

From memory, my instruction manual tells me that the symbol (a vertical
line - or perhaps an exclamation mark - within a triangle) appears when the
SUGGESTED surface interval is over an hour OR if your max depth was in
excess of a certain depth, OR if your ascent rate, while within the no-alarm
limits, was at any time within the faster half of the permitted rate. To do
with microbubbles, this seems an excessively conservative set of measures,
but there you are.

If you go back in the water within an hour, your Vyper should work perfectly
well and will not (unless there is a malfunction) lock you out or penalise
you wilth shorter-than-otherwise-recommeded no-deco times, ascent rates etc.
It's a symbol which, as the words of the song, is "always something there to
remind you"

As to planning a subsequent dive, you could always use the PLAN function in
your Vyper OR (and I have found this to be very reliable) you can use your
PADI tables. For a given surface interval, your Vyper and the PADI tables
correlate very closely as to permitted no-deco times at various depths on
subsequent dives. If you are going to do this, remember to use the average
depth as recorded in your Vyper as the depth of the square-profile
equivalent dive you;ve just done.

Ken

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