520 showing actual position of vehicle about 100 yards out

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

Has anyone with this problem actually contacted TomTom, you never know they may know something.

shadamehr · Banned Joined: Apr 25, 2006 Posts: 507

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

It's happening in America too http://www.tomtomforums.com/showthread.php?t=7650

DeLorean · Posted: Thu Feb 28, 2008 12:34 am Post subject:

Removing QuickGPSfix seems to have cured the problem for me Very Happy

I did have another strange occurrence today however.
My TT910 got stuck in a weird cycle.
It locked onto 6~7 satellites for a split second, then lost them for a split second and continued to cycle like this continually.

I was in Basingstoke when this happened, but my TomTom displayed me as being in Warwick Shocked

A few prods of the reset button cured the problem.

Strange Confused

Is this anything to worry about?

Could it be related to the QuickGPSfix issue?

ronvking · Occasional Visitor Joined: Feb 27, 2008 Posts: 7

I'm not too sure that it can be a problem with the QuickGPSfix file because if I read my manual and Home files correctly all it does is tell the GPS where the sat's should be so that the GPS chip knows which sat's to look at and get the fix that little bit quicker. Once the signal is received from the sat it also tells the GPS its location and therefore the QuickGPSfix file is made redundant.

shadamehr · Banned Joined: Apr 25, 2006 Posts: 507

DeLorean · Posted: Thu Feb 28, 2008 5:13 pm Post subject:

Hopefully someone will get response from the TomTom regarding this issue and clear up the mystery Very Happy

Also, if someone (in the know) could enlighten us on the full mechanics of the QuickGPSfix, this may (of may not) rule out the QuickGPSfix.

Let’s watch and see Wink

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

Just spoken to someone who is knowledgeable about these things. He is pretty certain that the ephemeris adjusts for the distortion of the satellites orbits due to atmospheric changes. He said that if the satellitte is 100 metres higher or lower than expected it can give a inaccurate reading. Of course it also has the effect of finding the sattelites quicker.

He doubts that Tomtom compile the settings themselves but would get them from NASA, they could however, put the info into the files to download and it would easily be possible for them to make a mistake in this process.

Trevor1234 · Posted: Thu Feb 28, 2008 9:42 pm Post subject:

Hi Folks
All these theory’s are all very interesting but the fact remains that not everyone appears to be affected by this problem. We are all using the same satellites so why are certain users Zapped and others unscathed. It’s all very puzzling.
_________________
Tomtom Go 720.
Navcore 9.510
Central and Western Europe v855.2884
GPS World Traffic cameras
Home 2.7
iPhone 3G

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

Hi

6.20pm (GMT) 28/02/08 and my 720 went haywire ( as on previous occasions) In the Tooting london area.

This is not the 1st time!

I have had my TT720 for nearly a year so it dosnt need exchanging!!!!

Tom Tom MUST know what is going on, but wont admit it!!

dhn · Posted: Thu Feb 28, 2008 10:14 pm Post subject:

shadamehr · Banned Joined: Apr 25, 2006 Posts: 507

@ DennisN...

Edit... deleted. Thought it best to flag this up in a PM instead.

technik · Posted: Thu Feb 28, 2008 10:45 pm Post subject:

Maybe there is an intermittent fault with all our TT520/720 units?

Is this fault only showing on people that have had their 520/720 for at least a few months?

mikealder · Posted: Thu Feb 28, 2008 10:51 pm Post subject:

Is everyone that is experiancing this fault using TomTom Home to download the Quick GPS data? - the reason I ask is that I do not do this with my devices and I have not experianced the fault at all. - Mike

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