Vytec in cold water

[Ian@1904]

I had an interesting experience yesterday....First dive down to 20m in fresh water, 6c water temp 37mins. Out of the water for an hour and a half.
Second dive we dropped down to 35m, going down fairly slowly my no deco time came up very short. It took 14 mins according to my Vytec to reach 33m, at 17mins the computer went into deco. I was attending a course-observing, and so watched the trainee and instructor go through a genuine issue, which meant it was not appropriate to start signalling about my puter. When we reached 20m after 29mins I had 29mins of deco
One of the other divers also on a Vytec had 77 mins of no deco time at this point. After completing the same dive profiles.
The other divers were out of the water after 45mins, I stayed at 3.5m to clear the deco(weezle extreme plus and dry gloves mmmmm) and ended up with a dive time of 65mins, however I came up 15 mins after the other divers. In other words the dive time calculation had gone a bit wrong.......The depth reading was fine.

Has anyone else experienced the dive time on a Suunto going a bit wrong in cold water? FWIW I have completed 350 dives on the Vytec with no significant issues.

[turbanator]

Originally Posted by Ian@1904

Has anyone else experienced the dive time on a Suunto going a bit wrong in cold water? FWIW I have completed 350 dives on the Vytec with no significant issues.

I have when the battery has been a bit flakey, so has my Aqualand.
It seems that there is enough oomph for the dry land stuff, but when you cool that battery down and add the extra loading for the dive functions, then they have a bit of trouble.

Usual drill really, bung a new battery in, wait 24 hours unless you have a backup, then monitor/compare on your next dive.

r
P

[PW1664]

I had a similar issue with an old Suunto Eon.

Diving out of Oban mid Feb, every time I looked the the screen I was getting strnge info, it wasn't obvious at first but as the dive went on I realised the time and NS times were wrong, depth again was ok.

The I saw the screen fade and come back, I saw this a couple of times.

The battery was daown to one bar.

I changed the batteryon the boat and had no further problems.

I put it down to the cold water and low battery voltage.

[Mal Bridgeman]

Originally Posted by Ian@1904

The other divers were out of the water after 45mins, I stayed at 3.5m to clear the deco(weezle extreme plus and dry gloves mmmmm) and ended up with a dive time of 65mins, however I came up 15 mins after the other divers. In other words the dive time calculation had gone a bit wrong.......The depth reading was fine.

Why stay in the freezing cold, if you knew it was b*ggered?
Mal

[uwila]

I've dived my Vytec in water at -1.5C for dive times up to 56 minutes and never had a problem.

It went bananas in the Red Sea in water at 23C, but a bettery change sorted it out immediately.

Cheers, Chris

[scuba g]

Originally Posted by Ian@1904

I had an interesting experience yesterday....First dive down to 20m in fresh water, 6c water temp 37mins. Out of the water for an hour and a half.
Second dive we dropped down to 35m, going down fairly slowly my no deco time came up very short. It took 14 mins according to my Vytec to reach 33m, at 17mins the computer went into deco. I was attending a course-observing, and so watched the trainee and instructor go through a genuine issue, which meant it was not appropriate to start signalling about my puter. When we reached 20m after 29mins I had 29mins of deco
One of the other divers also on a Vytec had 77 mins of no deco time at this point. After completing the same dive profiles.
The other divers were out of the water after 45mins, I stayed at 3.5m to clear the deco(weezle extreme plus and dry gloves mmmmm) and ended up with a dive time of 65mins, however I came up 15 mins after the other divers. In other words the dive time calculation had gone a bit wrong.......The depth reading was fine.

Has anyone else experienced the dive time on a Suunto going a bit wrong in cold water? FWIW I have completed 350 dives on the Vytec with no significant issues.

In that case I would have exited the water, as you know something wasnt right with the reading, in a situation were you may have been the only one on a suunto then you might air on the side of caution? I dived with a mate who had an Aladdin Air and after the dive the no fly times were 6 hours in difference with the Aladdin being the less conservative.

[Ian@1904]

Originally Posted by Mal Bridgeman

Why stay in the freezing cold, if you knew it was b*ggered?
Mal

I was not cold.

Battery is on 4 bars so plenty of charge

[uwila]

Originally Posted by Ian@1904

I was not cold.

Battery is on 4 bars so plenty of charge

What degree of conservatism have you and the other diver set? Does that explain any difference?

[Ian@1904]

Originally Posted by uwila

What degree of conservatism have you and the other diver set? Does that explain any difference?

None and RGMB 50

[John_C]

Originally Posted by Ian@1904

None and RGMB 50

I woulld set RGMB to 100% and double check that the PO is set to PO not P1 or P2.

My wife and I both have the Vytec (hers is the DS) and recently out of curiosity we set hers to P1 and left mine at PO, she clocked up 20mins of Deco on the same dive when mine was less than 4mins. Worth checking it.