First time subsurace usage surprises

[Miika Turkia]

On Thu, Aug 2, 2012 at 1:04 PM, Lutz Vieweg <lvml at 5t9.de> wrote:
> On 08/02/2012 12:46 AM, Linus Torvalds wrote:
>> Sure, you want to have a gauge for backup
>
> If you consider a single mechanical gauge safe enough, then a single
> wireless sensor is at least as safe.
>
> A mechanical gauge always "displays" a value, even if that value
> is total bogus because something inside is corroded or broken.
>
> Using a wireless pressure measurement, chances of being displayed
> a total bogus value are smaller - the pressure sensor itself it
> practically "solid state", and if the electronics of either the
> sender or receiver fail, you will most likely see no value or some
> sort of error indication. And in that case, you can still end your
> dive doing a very normal ascent.

Here is an example of a totally bogus value on wireless transmitter.
It is quite rare to end a dive with more air than one had at the
beginning ;)

I had a couple of dives with clearly bogus readings, however, some
times the wireless sensor got stuck to specific reading or gave 10 or
20 bars more than just a minute before. And then there were these
cases with way too high readings. At least in some of the bogus
situations my Vyper did indicate an error on the pressure reading but
not in every case.

miika
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