Subsurface-mobile, weird behavior with GPS

[Dirk Hohndel]

> On Mar 13, 2016, at 1:11 PM, Salvador Cuñat <salvador.cunat at gmail.com> wrote:
> 
> 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.

It just asks Android for a position, requesting best precision available. So if you have GPS turned off, it will use cell tower triangulation or other methods.

> 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.

I need to read through the API docs to see if I can request a minimum precision or something. I still haven't figured out what's up with those precision problems. It's on my very short todo list. With approximately 5378 other items. So if anyone feels ambitious... by all means, go ahead, figure out what's going on...

/D