Path: news.eternal-september.org!eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: VanguardLH <V@nguard.LH>
Newsgroups: comp.mobile.android
Subject: Re: What can't you do on Android WITHOUT a Google Account set up in the OS?
Date: Sat, 11 Jan 2025 14:01:53 -0600
Organization: Usenet Elder
Lines: 54
Sender: V@nguard.LH
Message-ID: <1hy509rjrlk3t$.dlg@v.nguard.lh>
References: <vl2831$1im$1@nnrp.usenet.blueworldhosting.com> <ltsnkuFjg5eU3@mid.individual.net> <comn4lx1f3.ln2@Telcontar.valinor> <vlc1u5.13e0.1@ID-201911.user.individual.net> <23gpilr5u1tn.dlg@v.nguard.lh> <fhoo4lx549.ln2@Telcontar.valinor> <vldlkj$volh$1@dont-email.me> <1p4zocksq8uk1$.dlg@v.nguard.lh> <lud2rhFacr3U2@mid.individual.net> <lud3vfFaar8U1@mid.individual.net> <luf4biFkbk4U1@mid.individual.net>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Trace: individual.net BxqDO1C22OT/NGRGTvQsZwzaQVYk2IrOEdbP8cyKw6iFB4KBna
Keywords: VanguardLH,VLH
Cancel-Lock: sha1:9jij+1QBPXyiv7NVVs49H81LGac= sha256:bukW3V5w7TFaPvD8OQmEYWIjlNn2skavqMoqpoT2QBM=
User-Agent: 40tude_Dialog/2.0.15.41

Arno Welzel <usenet@arnowelzel.de> wrote:

> Andy Burns, 2025-01-10 18:33:
> 
>> Arno Welzel wrote:
>> 
>>> VanguardLH wrote:
>>>
>>>> The magnometer periodically requires re-calibration (the 3-D figure 8
>>>> roll) to get compass readings correct.
>>>
>>> A magnetometer has nothing to do with GPS.
>> Occasionally when using google maps from my phone e.g. on a train, it 
>> will report "low accuracy" and request the figure-8 calibration, I think 
>> it can use the magnetometer better to sense the direction of travel?
> 
> The magnetometer is mostly relevant if you do *not* move and want to
> know, in which direction the device is oriented.
> 
> However when you move, your direction of travel can will be computed
> based on your movement - the magnetometer is then completely irrelevant
> and will *not* used for that.

A "test" didn't give any details just what was the test.  Did Wieser
compare his GPS reading (does he have an app that tells him that, and to
how many satellites he was connected, and what type of satellites, and
if they were changing because he was moving) to some map app's GPS
coordinates?  Was he moving, or stationery?  Did he mark a waypoint
(again, in which app) to move away and then return physically to the
same location to see if he was still shown at the same GPS coordinates?
My response was generic based on a vague test of something to do with
GPS on his tablet which is also undefined, and different devices don't
have the same accuracy (he's using a tablet, not a high-end GPS tracking
device or even a military one, so there will be some hysterysis in
re-measuring a waypoint upon return due to the 1 to 5 meter accuracy
assuming his tablet is capable).

And, yes, A-GPS is for speed in locking into satellites to THEN get
positioning, and that is important when moving when satellites come into
and out of range.  And, like your suggestion, perhaps you should read
the referenced articles which mentions a 50 bit/sec download rate to get
the positioning data from the satellites (that's plural), and if a
satellite gets disconnected, and another found, then the download starts
all over.  The only data that is instantaneous between device and
satellite is time.  The endpoint GPS device computes its location.  It
isn't told to the device by the satellite.  Wieser's "test" wasn't much
of a GPS test if all he did is one sample while fixed, and then compared
to what?

Rather than nitpicking on the responses, just what is YOUR suggestion to
Wieser regarding his statement of "a test with the GPS of a tablet I had
didn't give me much confidence in its accuracy"?  Come on, now, give
some specific suggestions, so we can nitpick on your suggestions being
unfocused for a vague "test".