520 showing actual position of vehicle about 100 yards out

nucleus · Occasional Visitor Joined: Jun 29, 2007 Posts: 2

Ok, here's what I have experienced:

Hardware - XDA Orbit (HTC P3300)
Software - Navigator6 and CoPilot7 (not at the same time!)

This evening I had a repeat of the same problem as others are having and I had a few days ago - positional error of about 200m to the NW from true position. This happened with both Navigator and CoPilot so cannot be due to any QuickFix download error? Also, while the TT software just couldn't cope and steadfastly refused to show the correct position, CoPilot would figure things out after about 2 minutes of travelling in roughly a straight line. Things were then fine until a sharp change of direction which would then throw it into confusion until another period of straight travel after which it would 'find itself' again.

So, my theory is that there is a satellite up there that's sending out slightly duff data - CoPilot is able to figure out after a while that what it's getting from the 'rogue' satellite doesn't agree with the other 6 and compensate, while TomTom isn't that clever!

This might also explain why the problem is intermittent and probably wont occur tomorrow morning since the satellite in question will be over the horizon?

All this from someone who knows next to nothing about GPS so feel free to shoot me down if none of the above makes sense....

portman · Posted: Fri Feb 29, 2008 12:18 am Post subject:

It happening cos its a leap year, that extra day is reeking havoc with the time/date!!!!!!!
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lamplight · Regular Visitor Joined: Sep 13, 2004 Posts: 130

It's getting a bit galling. Every single night for the past week or so, my positioning goes haywire at the same spot for about a mile on my way home from work and then 25 miles further on as I approach home. Tried it with and without QF and still the same result. I look forward to this being recognised as an issue by TomTom and, if possible, to its resolution. And it's interesting that a colleague with a TTOne is having similar issues all of a sudden.

Philgo · Regular Visitor Joined: Jan 02, 2008 Posts: 80

Philgo · Regular Visitor Joined: Jan 02, 2008 Posts: 80

Oldboy · Posted: Fri Feb 29, 2008 7:17 am Post subject:

mikealder · Posted: Fri Feb 29, 2008 8:41 am Post subject:

nucleus · Occasional Visitor Joined: Jun 29, 2007 Posts: 2

To restate the point from earlier, this isn't just a TomTom (hardware or software) problem because affects CoPilot navigation software running under WM6 as well. What's hard to understand is why some people are seeing the problem and others not?
FWIW I also have never used TT Home with my XDA; on the other hand I do use QuickGPS which is a service provided by the manufacturer HTC. Never had any location accuracy problems until last week.
Still think on balance that one of those satellites needs rebooting!

Nigel42 · Occasional Visitor Joined: Jan 05, 2007 Posts: 51

FAO Mike

Yes I am using quickfix, On a 48 hour basis. BUT after the download everything works fine, for a number of hours in fact.

The problem always occurs at the same time of day but not every day.

Hope this helps.

Has anyone heard from Tomtom or is the silence deafing?

Hoppy · Posted: Fri Feb 29, 2008 9:47 am Post subject:

When I did an update last night to QuickGPSfix then switched my 520 on it showed my home/start posistion about 100 yards out. After I had switched maps a couple of times between UK and USA then checked again and my home/start posistion was correct again. Timescale was about 15 mins. Which would tell me that the GPSfix update was incorrect then when the unit aquired the Satalites properly it corrected the posistion.
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shadamehr · Banned Joined: Apr 25, 2006 Posts: 507

This seems to be getting more and more common, instead of less frequent, once only glitches.

Alas, as I posted elsewhere, I was unable to get any further info out of TomTom, because all they said was "we'll exchange your unit".

If users GENUINELY are getting this on other devices however, or those that don't use QGPSFix also see it happen, then it points to something other than the QuickGPSFix file being to blame.

But it's always all to easy to speculate. I'd like a real response from TomTom ideally.

I still think it very important for this thread to expand and grwo, if others have this issue though, so the word might actually reach TT.

Curious.

Andy_P · Posted: Fri Feb 29, 2008 2:25 pm Post subject:

Same again driving home last night.
Time: about 20:15
Location: South West London

Started off about 150-200 yds due south of correct position, but it steadily improved over twenty minutes or so. After half an hour was back on track.

Much easier to see if you do NOT have a route set (as TT cheat even more than usual with the snapping to roads and assumes you are staying on "the route").

Signal strength was excellent at all times, 9-11 satellites.

Same route (in reverse) this morning. Spot on all the way.

What IS going on? Stop it!

Philgo · Regular Visitor Joined: Jan 02, 2008 Posts: 80

dhn · Posted: Fri Feb 29, 2008 6:03 pm Post subject:

I do believe Andy nailed the reason in an earlier post....Aliens! Laughing

Trevor1234 · Posted: Fri Feb 29, 2008 9:19 pm Post subject:

I have had my 720 for around three weeks now and have never connected to ‘Home’ since the initial setup. I too (same as Mikealder) never bother with the Quick GPS download. My 720 usually has my position before I have placed it in the car mount and put my seat belt on so I can’t see the point of the Quick GPS option.

Anyway, what I am trying to say is I have not suffered the from the ‘Wandering off route’ syndrome yet and if I do at some time in the future it will mean we can rule out the Quick GPS download as the culprit.
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