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From: Frank Slootweg <this@ddress.is.invalid>
Newsgroups: comp.mobile.android
Subject: Re: How will the police find me.
Date: 22 May 2024 15:28:22 GMT
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micky <NONONOmisc07@fmguy.com> wrote:
> In comp.mobile.android, on 22 May 2024 13:39:35 GMT, Frank Slootweg
> <this@ddress.is.invalid> wrote:
> 
> >micky <NONONOmisc07@fmguy.com> wrote:
> >[...]
> >
> >> Not only that. the AllTrails map showed my location and it zigzagged
> >> near the trail I was supposed to take, even though I was almost always
> >> right on the trail I was supposed to take.  I think this was because GPS
> >> is not perfect  
> >
> >  Was this in a tree covered area or/and with overcast weather? Both
> 
> Yes, both of those. 
> 
> >tend to weaken the GPS signal, which is already a very weak signal to
> >start with. (Imagine the satellites transmitting from some 20,000km
> >(12,500mi) above the earth to your smartphone.)
> 
> But it isn't the strength of the signal that matters, it's the time
> delay iirc.   Does Going through clouds and leaves delay the signal? 

  The signal strength does matter, because if it's too low, the
smartphone can't pick it up. I.e. similar to a 'cell' signal, if it's
too weak, you won't get a connection.

  In my experience, both with 'real' GPSs - i.e. dedicated devices - and
smartphones, trees and clouds are the main problems for getting a fix.

  Indoors is also a problem, but it's not often needed in such
circumstances. In a vehicle, it's mostly not a problem, because of the
amount of glass. I even successfully used it in a normal commercial
airplane. (The plane didn't have a screen showing its current position,
etc., so I took my tablet, fired up OsmAnd+ and held the tablet somewhat
close to the window.)

> >  Moral: Get out of the woods and only hike on a sunny day! :-)
> >
> >[...]