D9 Desat readout

[griffon]

Hi Folks,

I have a new to me D9, that I have a few dives with. My previous comp was a Oceanic Data trans plus, this had a nice little desat bar that would go down after a dive and give you a indicator of if you where ready to go. This would usually take the expected about an hour after the first dive (allways seemed to align with the tables about right).
The D9 doesn't seem to share this handy data (oddly shows no fly time and surface interval only), digging through the manual I found it says to enter plan mode and the desat time will flash then dump into planing mode.
I gave this a shot, but the desat numbers were totally out of wack. First dive I tested this with I had not been out in weeks, it was max 60 feet 27 minutes total dive time. The profile looks fine, and no warnings in the dive log and I came up with around 1300 PSI (full safety stop, no deco etc, nothing unsafe at all)

Yet the Desat time was six hours forty five minutes.... WTF? Clearly that is not supposed to be a count down to second repetitive no deco dive ... After a hour plus interval, second dive pushed the desat time to over 11 hours, against nothing bad in the profile.

So I don't get it. can anyone share some insight on how the desat number on the D9 are supposed to work and is there anything equivalent to the simple oceanic desat count down? I can always break out the tables and use the surface interval counter (and did jut to sanity check my second dive), but that dose not thrill me as regular thing.

Thanks!
Griffon

 

[DiveNav]

..... this had a nice little desat bar that would go down after a dive and give you a indicator of if you where ready to go. .....

Are you sure about this? Most likely it was the Nitrogen Loading Indicator and NOT the Time to Desaturation.
Those are 2 slightly different animals.

All Oceanic dive computers have the Nitrogen Loading Indicator Bar Graph. The D9 does not have this indicator.

I suggest you take a look at our online classes: Suunto D9 and Introduction to dive computers

Alberto (aka eDiver)

 

[griffon]

I'm sure it said desat with the time below.... I checked out the online classes but they didn't seem to offer more info then the manual. If the desat number on the front of the planner is not a counter I'm unclear what is. It's the only reference in the manual.
"WHEN ENTERING THE PLAN MODE THE DISPLAY FIRST BRIEFLY SHOWS THE REMAINING DESATURATION TIME BEFORE GOING INTO PLAN MODE. USE UP AND DOWN BUTTONS TO SCROLL DIFFERENT NO-DECOMPRESSION LIMITS. NO-DECOMPRESSION LIMITS LONGER
THAN 99 MINUTES ARE DISPLAYED AS “–”. "

I can get a more reasonable number with in the plan mode by setting a depth but this is not a counter per say.

 

[DiveNav]

what i meant was: "are you sure that the OCEANIC dive computer you mentioned in your OP ...... had a nice little desat bar that would go down after a dive and give you a indicator of if you where ready to go. ....."??

As mentioned in my previous post, in the Oceanic dive computer that bar is NOT the Time to Desaturation bar but is instead the Nitrogen Loading Indicator.

Those (Nitrogen Loading Bar and Time to Desaturation) are 2 slightly different animals.... and are used in different ways.

The D9 does not have a Nitrogen Loading Indicator bar graph nor a desat bar

 

[boat sju]

Griffon,

I believe the DSAT time is the time until you're back to an A group. Doesn't really have anything to do with your required surface interval. But I don't have a D9 so I can't say for certain.

 

[griffon]

I see what you are saying... though the language around plan mode where this is found in the manual makes it sound like the usage would be that of the nitrogen reduction count. That said I see your point I'm just not sure where that leaves me. Aside from breaking out the tables (or using the theoretical plan mode, ugh same thing really), how do you really tell on the D9 how long your interval should be based on your actual dive profile?

what i meant was: "are you sure that the OCEANIC dive computer you mentioned in your OP ...... had a nice little desat bar that would go down after a dive and give you a indicator of if you where ready to go. ....."??

As mentioned in my previous post, in the Oceanic dive computer that bar is NOT the Time to Desaturation bar but is instead the Nitrogen Loading Indicator.

Those (Nitrogen Loading Bar and Time to Desaturation) are 2 slightly different animals.... and are used in different ways.

The D9 does not have a Nitrogen Loading Indicator bar graph nor a desat bar