High altitude diving and airplane mode

[dmainou]

Hi guys,

@ Mexico city right now. Altitude 2240m above sea level with a presure 750 bar.

I tried using my MK2 for a local lake dive but the airplane mode prevented me from doing so.

Could it be possible to modify the behaviour to a higher altitude?

Thanks

[heinrichsweikamp]

Hello,

The high altitude does not prevent any diving at all, just descent to at least 1075mbar ambient pressure (about three meters in your case) and the unit will be in diving mode and stay there until you have surfaced.

regards,
Matthias

[tiefunten]

If I understand the airplane mode correctly, it doesn't prevent you from diving. You only have to dive deeper until the OSTC switches to divemode. There has to be another thread in this forum, where Matthias already said something on this topic.Unfortunately, I can't find this at the moment.

[tiefunten]

Too slow...

[heinrichsweikamp]

Hi all,

I have to admit that there is indeed an issue in the 1.90 about this. Under certain circumstances the OSTC thinks it is at the surface even if at 3m depth.

This has been fixed for the 2.0 stable.

Regards,
Matthias

[Cédric R.]

Hi,

I dived with two OSTC MK2N v1.90 on air in a lake over 1500m altitude (and hopefully an Uwatec computer as backup)... both OSTC computers didn't switched to dive mode before 10m depth.

During the dive the behavior was completly crazy, every 5 minutes both OSTC computers started a new dive : beggining in surface mode with altitude displayed at for example -4000m (always a funny minus value), then after a few seconds a descent rate of 99m/min and finally times to times I received some random deco stops (according to my Uwatec computer I still was on a no deco profile).

After the 40 min dive both OSTC computers are displaying in the logbook 6 dives of exactly 5 minutes with the correct deepest point reached during those 5 minutes (according to my Uwatec computer profile those 6 logged dives may correspond to the dive time over 10 m depth).

I'll upgrade to v2.0, as the bugs seems to be fixed and give another try.

Best regards,

Cédric

[swissdiving]

Hi Cedric,

I had the same issue with dives on 2400m, and it is as Matthias says, a bug which is supposed to be fixed with V2.0. Unfortunately, I haven't had a chance to test it. Next weekend I will be doing some dives at about 1000m, so we'll see if there is still an issue.

Last week I was on a trip to the Red Sea. Airplane mode worked perfectly.

As a matter of fact I did 20 "recreational" dives and the 2N worked absolutely perfect. Here some points which I really appreciated

- Display was brilliant, especially with night dives
- Configuring Nitrox was a breeze as opposed to my backup SmartCom
- NDL, DESAT and NOFly times matched the other dive computers on the boat pretty closely
- Battery was after 20 dives of 60min plus still app. 80%
- Air integration, who needs it?

There is no way I would swap to another dive computer.

[swissdiving]

Hi all,

I did 3 dives at 850m above sea level. The 2N went into dive mode at a depth of app. 2m. Dives were recorded flawlessly though since the max depth was 12 meters, we would have been hard pressed to get into deco.


The only problem I noticed was that it was very difficult to switch on the 2N by hand which may have been caused by the very low temperatures (air temp +4C / water temp +10C)