Subsurface-mobile, weird behavior with GPS

[Salvador Cuñat]

Hi all.

I've accidentally run into a weirdness with the positioning system, as I've
unadvertedly activated the service without GPS, and surprisingly I've got a
fix.  More surprisingly I was at indoor at home, where i have never ever
got a single gps fix.

Obviously I had active the telephone network positioning system, and so the
device got my position this way.

Now my doubts:  I didn't know subsurface-mobile used this option, so I
don't know if it is a failure or a feature.

On one side it can be useful in closed environments where there is a bad
(or none) GPS signal.  On the other side, it can give big deviations if
there is a single cellphone tower avaliable (as it will be, for sure in the
sea, and probably in the mountain).  I'm remembering the strange positions
recorded by Willem some time ago.

Perhaps it would be a better aproach if the app forces the user to choose a
single option, or, at least, gives an advice if the GPS is turned off, as
there is actually none.

Regards.

Salva.
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