Suunto Mosquito, Concerned!

Schwim · Sep 25, 2004

Hi All, Just purchased a Mosquito on the net from a popular site (which advertized here) in Spain. On two dives in a recent trip to Turks and Caicos, I reached the no deco limit and the computer showed a NDL of zero. I came up to see the NDL rise to a reasonable time and hung out with plenty of PSI. When I transfered the dive to my laptop, the graph showed a different story than was portrayed by the computer during the dives. In the graph mode, the computer was showing ascent times (sometimes binking) and a ceiling of 10 ft. This info never showed on the wristop computer during the dives, only a NDL limit. I'm confident of this, as I was watching my new computer closely. I did extra long safety stops at 15 ft. Has anyone ever seen this? Do I Need to send it back to the non-authorized dealer overseas?

Thanks,
Schwim

RichLockyer · Sep 25, 2004

That's normal. The download does not bring in 100% of the data... only the 20-second samples (or are they 60 on the Mosquito?).
There's a comment in the manual that the downloaded decompression information will not match reality.

Schwim · Sep 26, 2004

Rich, yes it is every 20 seconds. The downloaded profile shows extended times-- several uninterrupted minutes of ceiling and ASC time, which were never displayed on the wristop. It looks like the data was analyzed to a greater degree in the downloaded material. Even with only the no deco time displayed during the dive, no limits were violated according to the graphed data.

Thanks,
Schwim

Kim · Sep 26, 2004

I'm not sure about the Mosquito but on the Vyper you can change the sample speed to 10 secs. You have to do it through the dive manager software - not on the computer itself as far as I know.

Arraial · Sep 26, 2004

Kim:
I'm not sure about the Mosquito but on the Vyper you can change the sample speed to 10 secs. You have to do it through the dive manager software - not on the computer itself as far as I know.

Mosquito uses only 20 sec . There is a thread discussing the possibility to change to 10 sec using the Dive Manager software and simulating the stinger sample rate ( 10 sec). Haven´t tried yet...

Uncle Pug · Sep 26, 2004

So Schwim, you obviosly didn't die... did you get bent?
What does that tell you about dive computers?

MonkSeal · Sep 26, 2004

Uncle Pug:
So Schwim, you obviosly didn't die... did you get bent?
What does that tell you about dive computers?

Computer rots your brain

rab · Sep 26, 2004

The Mosquito samples at a fixed 20sec interval for download purposes. The maximum depth during each 20sec interval is the stored depth. DURING the dive, the computer is sampling depth much more frequently and computing your N2 load and NDL status as it goes. When the samples are "clipped" the main result is that the overall dive looks deeper. The more consistent your depth, the less this willl happen, but if you are rising and falling in the water column (even without exceeding the Mosquito's 30ft/min rate), the effect will be greater.

You might want to search for threads that discuss "riding the NDL" on a computer as the limiting "compartment" tends to shift to slower tissues.

-Rob

Schwim · Sep 26, 2004

Thanks, Rob (and everyone else) that makes good sense, I was right at the limit, but didn't actually cross over into a deco dive. The divemanager program overestimated my time at a deeper depth. I'm now more comfortable that nothing is wrong with the computer. I know that the Suunto algorithms are supposed to be quite conservative and wasn't as concerned about my health (Uncle Pug, I didn't get bent, as an answer to the supposed rhetorical question) as I was about the computer's function. I don't plan on testing this again though. Thanks, Schwim

Suunto Mosquito, Concerned!

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