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My OSTC has finally arrived!!

Following "the first new toy syndrome" (couldn't put it down) and getting it ready for it's first dive, I hardly needed the instruction book, it's very user friendly. I was really pleased with it's ease of navigation and screen layout. I found the simulator a wonderful tool especially when coordinating dive plans with buddy's. I have done 8 dives with it now including one night dive. WOW is the best way to describe the display in the darkness!! I do dive the GF quite conservative, 20-25/80-85 which ties in with my slate VPM-b con +2. (Extended Range certified) I think it's a wonderful peice of kit and a great addition to my diving equipment. Thank you very much HW.

HW, I was on a recreational dive with the 2N and my Suunto Vytec. (wall dive max depth 34m,on air, total dive time, 36mins) As you know the recreational computer will count down to your NDL thus either allowing you to ascend from say a wreck or allowing you to multi level a wall dive as I was doing. I got as close as 3mins to the NDL on the Suunto and it of course wanted the mandatory 3min stop on the ascent. The 2N wanted 3mins at 6m as it happens. I understand that the OSTC is not designed for multi dive days (Holidays) recreational diving but the thought I had while on that wall dive was imagine how wonderful this computer would be if it had a "recreational dive mode" specifically showing the NDL and profiling the dive in a similar way to most recreational computers. So when diving with or leading a group your NDL is usually fairly close even with different brands of computers given a similar profile. What a wonderful marketing opportunity...Imagine one computer suits all, from Open Water to Tech. Just a thought while cruzin at 30m. Just wondering what your thoughts HW on that would be??
Thanks again for my 2N HW!!

Bruce, A very happy customer!!

Hallo Bruce,

innerhalb bestimmter Grenzen kannst Du selber über die GF Faktoren eine Anpassung vornehmen. Wenn Du ein wenig "spielst" wirst Du eine Einstellung finden, die ähnlich der anderen Computer ist.
Probier es mal

translate by google

Hi Bruce,

within certain limits, you can make yourself over the GF adjustment factors. If you "play" a little you'll find a setting that is similar to the other computer.
Try this:)

Hello Bruce,

Thanks for the nice comment

I don't understand fully your 6m3' stop... What was the GF used ? Specific gas settings/switches ? If you have a doubt, can you post me the profile data (best in binary format from DivingLog 5.0).

Thanks,

Hi JeanDo,

the 3m/3m stop in Suuntoc computer is an additional stop that is shown in the dive computer just for safety. It has nothing to do with deco calculation.
If you skip this stop nothing will happen.
It ist just a 3 minutes timer that starts at 3m when your normal deco is finished.

For my point to view, this is unneccessary. There are so many possibilities in the OSTC firmware to add more safety that you dont need this kind of stop.

regards
Rob

Bruce, as far as I understand the Suunto and the OSTC are quite similar in terms of operation. Both computers constantly track time and pressure. By using these values they compute either the NDL or decompression stosp, The OSTC displays NDL or next stop, depending whether it is "recreational" dive or decompression dive, in the middle of the right part of the display.

The most significant difference between both computers probably is the algorithm to compute tissue gas pressure and therefore modelling the NDL or decompression stops.

So depending on the individual settings on your computers it might well be that one of them is sill showing NDL while the other one is on decompression mode. Frankyl speaking, I think it is quite normal that two computers from different vendors compute different results. Decompression is not exact mathematics.

Hi guys,

I read your comments with interest
JeanDo- Max depth we reached was 34m, majority of the deeper portion of the dive was bet 28-32m. Gas mix selected was 21% for the whole dive. GF was 25/80.I have the last stop set to 6m. I started multi-levelling after around 6-7mins. I saw the OSTC counting down towards a deco stop, which then gave me 1min at 6m and so on. At the time the OSTC gave me the first min, the Suunto RGBM still had another 6mins to the NDL. Please don't misunderstand me, I am in no way trying to compare these computers. In a recreational sense I found it far easier to multi level the dive using the NDL of the Suunto to maximise our dive time without going into so called deco, beyond the NDL,especially with other divers following me using recreational computers. For me to stay within the NDL of the recreational computers following me and to maximise the dive time without going beyond the NDL by only using the OSTC would have needed some guess work. When we finally made our way up to the top of the wall and eventually into 6m. The Suunto because I stayed within the NDL only asked for the manditory 3 mins at between 3 and 6m. The OSTC had accumulated 3 mins of deco time over the dive, that it wanted at the 6m stop.
I understand it is not designed as a recreational computer. I love the OSTC and would love to be able to take it on every dive and also use it like a recreational computer, to give me NDL similar to others I am diving with. And following onto repetitive dives in the day too. When we are doing our deeper diving with twins and stage mixes it's awesome. I've always used slates and computers in gauge mode so you can see why I love the OSTC. But if there was such a button as "Recreational dive mode" If all my dive buddy's had an OSTC then it wouldn't matter as much. But just trying to gauge it using the time to deco on the OSTC and the rec computers NDL while multi levelling is a bit tricky. Imagine how flexible the OSTC would be. I hope this explains it a little better.
I suppose in a nutshell, just to be able to track recreational computers NDL swimming the same dive profile.
Gunky- I will try your suggestion too and see if it can get close to following the Suunto.
Thanks for your comments, Rob and Peter.

Bruce.

Hi Bruce

Why do you use GF algo for this kind of dives ?
And especially with 25/80 values ?
these values are adapted to trimix dives (imho)

if you want to be close to the Suunto RGBM model, you'd better use ZH-L16 algo and set parameters CF11 and CF12 to 125 and 85

but OSTC will not show a safety stop for 3' at 6m. Just use stopwatch for that

Hi Bruce,

GF 20/80 is very conservative with air as breathing gas. When I'm using this computer for recreational diving, I switch it to ZHL-16 OC without GF. The computer than matches most recreational computers! The only thing is, you are responsible for your safety stop then...

Good morning from Australia!

Just reading your comments and advice with interest. Well isn't it funny how the simple things staring you in the face seem to go unnoticed and you sit back and think to yourself....Gee why didn't I think of that!!
Well thank goodness for forums like this and you guys out there that don't just point out the complicated stuff but sometimes the simple things too!
Bardass and Tiefunten, many thanks. I have a double dive on Saturday first a wall dive I'll max at 30mtrs then multilevelkeeping within the NDL of the Suunto. 1.00hr surface interval then followed by a wreck dive on a WW 1 Sub 28mtrs to the sand. I'll set the OSTC as you guys have said and compare computers through the dives and see how close they are. We have had some nasty weather here in Victoria and getting out to the deeper wrecks needs good conditions. Each time I go in the shed and see my twins, 50 and 100 mixes, I think and hope maybe next week! In the meantime we just keep diving where we can!!

Thanks again,
Bruce.
OSTC 2N 2241

good dives

Bardass- with reference to your post

In changing CF 11 and 12 to those percentages would I be right in thinking this would add some conservatism to the dive?

Thanks Bruce.

Shit! I wanna dive in Australia, too. Greetings do down under.

Bruce > you're right, you add some conservatism to your dives.

125% saturation : your saturation is 25% faster than the standard algorithm
85% desaturation : your desaturation is 15% (100-85) slower

The standard values of 110% saturation and 90% desaturation result in almost the same NDL or TTS as when using Uwatec-Computers.

I would like to dive in australia now, too. Have a nice trip!

Thanks again guys!

Yes we are blessed with the diving here in Australia. With some wonderful destinations close by too. We have a little house in the Philippines which is a great springboard to some awesome dive destinations. Me and my little OSTC are going to have a fab old time starting Saturday morning!! I am 10mins from the ocean and 1 hour from Melbourne airport. I can't get enough of it, just love being underwater. Wrecks, reef, walls or just exploring on the scooters. Importantly I am also blessed with some great dive buddy's too! Sharing the adventure, living the dream!

Bruce.

Bruce, from Australia Had to be Bruce really

Diving in Oz is very nice indeed. I had 2 weeks out there (not long enough) Coral Sea, Osprey Reef, Broughton Island. Fantastic..

Pick up my OSTC next week and will be diving for two weeks in Dahab - Red Sea so I can't wait. I was planning to just use the stopwatch to do a 3 min stop at the end of my dive to "match" my other dive buddies who have Suunto's.

I understand the 2n should show me a NDL as a Suunto (Gekko) does anyhow.

I bought the OSTC though to start my Tech diving in Oct