Maps constantly zooming out/Average Speed Jumping about

peterc10 · Posted: Sat Oct 20, 2012 10:53 pm Post subject:

Earlier I tried an experiment. At home with a satellite fix I switched on CamerAlert and stood still for a minute. The spot speed showed 0mph throughout. The average speed started at zero then started to creep up to 19mph, before falling down to about 6mph.

How exactly is the average speed calculated? From within CamerAlert? Or by another app or system? Does CamerAlert calculate it from the static positions or one-off instant speeds it is fed by the sat nav chip, or does the chip calculate it all, both single point and average and feed it to CamerAlert.
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M8TJT · Posted: Sat Oct 20, 2012 11:32 pm Post subject:

I just tried the standing still trick with a good sat lock and mine also started at 0 then jumped to 31 after about 10-15 secs, then jumped to 21 after another 10-15 secs (instantaneous speed remained at 0 throughout)

M8TJT · Posted: Tue Oct 23, 2012 4:22 pm Post subject:

Have just done another run. Seemed OK at first, but jumped to 820 when stationery. Took a gps log of the trip (2 sec intervals), and there were no anomolies in either speed or position.

smar · Occasional Visitor Joined: May 22, 2009 Posts: 7

Thanks everyone for all your help in testing this - I'm glad I'm not the only one!

Having been a developer in a past life, I would have thought that it would be reasonably straightforward to add some sort of validation and smoothing in the average speed calculations to avoid this? Even IF (and that's still a big if) the instantaneous speed reported internally by the GPS jumps for a split second, we should be able to recheck a second later and confirm reasonableness of the value etc.

Anyway, would really appreciate a fix to both this and the other tiling/zooming issue. I note that other nav related (non Google) apps don't have the tiling/zooming issue - e.g. CoPilot or Radaroid etc. This used to be one of my must have apps on an iPhone and really look forward to the Android version working fully.

Thanks again.

golf747 · Occasional Visitor Joined: Aug 14, 2005 Posts: 33

Well interesting reading as I have had this issue as well. Running Ca on HTC Desire S. As others have said application regularly zooms out and back in again. Also find the movement on the screen a bit 'jerky'. Put that down to slow processor? The zooming in and out happens whether google maps is running or not. I often drive with no data/3g on so just relying on PGPWS app to warn. Which it does Ok but would be good to stop the zooming in and out.

M8TJT · Posted: Wed Oct 24, 2012 1:46 pm Post subject:

AliOnHols · Pocket GPS Verifier Joined: Oct 15, 2008 Posts: 1936

adamwolfe · Posted: Thu Oct 25, 2012 1:32 pm Post subject:

253 · Posted: Thu Oct 25, 2012 10:18 pm Post subject:

Well, going to add my two pence worth, but don't think it is going to add to the debate much.

Bottom line is, I can't replicate what you folks are getting.
Have a GS3 at the moment, have tried CA whilst sat in the launderette for 45 mins, good GPS, with and without Maps active.

The best I could do was for the speed to flicker between 0 and 1 for less than a second on three separate occasions. If I hadn't actually been looking at the phone I probably wouldn't have seen it.

Just driven 160 miles this afternoon, with CA running, no maps and no navigation stuff running, and it didn't give a false reading at any time that I could see.

Bit of a peculiar glitch this.
Wonder if it's anything to do with the version of Android and/or any of the chips for the GPS.
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M8TJT · Posted: Thu Oct 25, 2012 10:44 pm Post subject:

Are you talking about the speed readout or the average speed readout? I am sure that the speed readout is ok for everyone?

M8TJT · Posted: Thu Oct 25, 2012 10:46 pm Post subject:

Are you talking about the speed readout or the average speed readout? I am sure that the speed readout is ok for everyone?

peterc10 · Posted: Thu Oct 25, 2012 11:44 pm Post subject:

M8TJT · Posted: Fri Oct 26, 2012 12:18 am Post subject:

Sent fom the stupid little on screen keyboard on my GA2. Don't quite know why it double posted though. I'll try again.

253 · Posted: Fri Oct 26, 2012 8:54 am Post subject:

M8TJT · Posted: Fri Oct 26, 2012 9:37 am Post subject:

Start the av spd display any time by tapping the speed readout. You don't have to be going through specs to start it.

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