520 showing actual position of vehicle about 100 yards out

pdegg · Occasional Visitor Joined: Mar 31, 2006 Posts: 10

Having used the 520 without a glitch for several months, last night on return from the Trafford centre to Staffordshire I was getting odd directions to get on the M60. When I checked the map, the cursor was showing me about 100 yards to the right of the road I was on. This continued to Sandbach services all the way down the M6, with Jane frantically telling me directions assuming I was on all the lanes down the side of the M way. Checked had lots of satellites, and did a full reset. Same thing- then suddenly jumped back onto the right position at about Keele. Anyone else had anything odd like this?

Daggers · Posted: Sun Feb 17, 2008 11:40 pm Post subject:

Yes - I had a similar problem once on my old Go300. It only happened the once, on a route I travelled regularly between Brackley & Solihull via the M40. It lasted until I reahed home, but had corrected itself by the time I switched the device on the following morning.

kichu1979 · Regular Visitor Joined: Jan 29, 2008 Posts: 99

Had this once, after few minutes of driving all was fine. Here's what people are reporting on US forum:

http://www.tomtomforums.com/showthread.php?t=7650

Looks like as some GPS chipset bug... becase its reports the position off-by some distance... interal GPS clock going crazy... hence the differences...

kichu1979 · Regular Visitor Joined: Jan 29, 2008 Posts: 99

Some other folks have investigated the issue and it looks like it was related to a faulty QuickGPSfix file being offered to download via TT HOME. All users experienced this at the same time, and for all of them problem disappeared after getting new GPSfix file via Home software.

Looks like TomTom put a broken GPSfix file for download... probably some sort of machine error during creating the file as I guess it's fully automated on TomTom side.

fao91 · Occasional Visitor Joined: Jan 08, 2007 Posts: 48

I have been having the same problem!! Shocked

The cursor is 30/40 meters to the right of my actual position.
It happens after i disconect from Home.
The solution:press the reset ,then press the on/off button and keep it pressed until it shows a black screen with system info.Release it and it will boot normaly.Your position is now correct.

pdegg · Occasional Visitor Joined: Mar 31, 2006 Posts: 10

Thanks Chaps - if it is the GPSFIX data and not the device then I'm relaxed about it.

Andy_P · Posted: Mon Feb 18, 2008 5:18 pm Post subject:

I've had exactly the same once before (except 100 yds to the LEFT), and I had it again for almost an entire journey on Saturday.

Powering down, and/or resets didn't help, but it came good after a while.

Interesting that others are having the problem at the same time. Kind of implies that it's a QuickGPSFix issue...

kichu1979 · Regular Visitor Joined: Jan 29, 2008 Posts: 99

Probably on of the GPXfix was broken and all people who experienced the problem downloaded that particular GPSfix file.

falkirk81 · Posted: Mon Feb 18, 2008 11:01 pm Post subject:

i've had the exact same problem over here in the USA with a UK bought 520. Never had a prob like this till the weekend. Was driving out and about, and from the start, the unit was out by a little. I thought nothing more of it, assuming it was just getting a slow lock on the satellites. Got to the main road, still had me about 100yds left of where i was. So i tried the usual, restart, no luck. reset using a pin, still the same, 100yds to the left. Luckily i knew the way to my destination, i only used the sat nav coz i needed it later that day to an unfamiliar destination. About 20mins later from where i had done the pin reset, and it finally snapped into the correct location. I can only assume, from the above posts that my QuickGPSfix wasnt very accurate, and that after the 20mins or so, the GPS had picked up the actual signal from the viewable satellites from where i was in Orlando. Was a bit strange and somewhat annoying. If i had been on a trip with no idea here i was going, i would have struggled!
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Wishlist · Lifetime Member Joined: Mar 10, 2005 Posts: 160

I am not so sure QuickGPSfix has anything to do with it as I have never downloaded it and yet it happened to me too! Shocked

shaun43uk · Posted: Tue Feb 19, 2008 1:05 pm Post subject:

I had this happen a couple of months ago all I did was go into GPS status and hit the configure button, this seemed to fix it.

agolder · Posted: Tue Feb 19, 2008 8:13 pm Post subject:

I'm currently having the same problem on my 920. Everything was fine until last Friday, and now it seems to intermittently think it's about 100 yards away from where it actually is. Full reset fixed the problem 1st time, but when subsequently switching off and on again, problem returns. Resetting the unit now seems to have no effect at all.

...interestingly, although normally weekly, tom tom home has offered me updated GPS fix files pretty much every day for the last few days (and yes, I've downloaded them each time, hoping each new one would fix the 'bug'!)... perhaps unrelated co-incidence?

dhn · Posted: Tue Feb 19, 2008 8:26 pm Post subject:

StanStill · Regular Visitor Joined: Feb 27, 2005 Posts: 81

This is strange, this happened to me tonight for the first time on my 520. It is showing me 100-200 yards away from my home and I cannot get it to move to the correct position.

I tried the above suggestion about connecting to Home and setting my current location as Home, which it did. When I switched on the 520, it was back to 100-200 yards away. I have tried a reset without success.

Anyone got an answer?

portman · Posted: Tue Feb 19, 2008 9:20 pm Post subject:

I had the same thing with my 720, about 200 yards out to the south.
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