VIA1535TM SLOW SATELLITE DETECTION

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Apr 3, 2024
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TomTom Model(s)
XXL550TM, VIA 1535TM, XL340.S
I have two VIA1535TM devices. Both are fully updated including quickgpsfix. It takes about 12 minutes from the time they're powered up before they detect satellites. Inside/outside makes no difference.

By comparison I also have a fully updated XXL550TM that detects satellites in seconds even indoors. I also have an XL340.S that's never been updated that detects satellites faster that the two VIA1535TM gps devices.. Both the XXL550TM and XL340.S are older devices and both detect satellites faster.

Is extremely slow satellite detection a normal characteristic or a known problem associated with the VIA1535TM model? If it's not normal does anyone know what can be done to correct it? The extremely slow satellite detection make them impractical to use. Thx.
 
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If the Quick GPS Fix update is up to date.
turning off the GPS the startup always takes a little longer, however if you put it on standby the startup is a little faster.
 
When a GPS device is routinely taking ~12 minutes to get a fix no matter that it's outside in clear sky, that likely means it's taking the extra time to pick up the almanac from an 'available' satellite - as though the device had just been taken out of the box and fired up for the first time or moved to another part of the planet before being turned on.

That's what the QuickFix process is supposed to prevent. Rather than having to pull down information from a satellite about where they all are every time the device is booted, a file is stored on the device that gives a week or two of reliable predictions for where they will be. For Nav3 devices (like your 1535s) and beyond, that data is stored in the "Download folder" specified by MyDrive Connect. I'd make a point of emptying that folder.

My guess is that something has gone very amiss with the QuickGPSFix data on both of your Nav3 1535 devices. Be aware that for Mydrive Connect, if you have two or more devices of the same era, during an 'update', your PC will SHARE any downloaded file information that it can amongst them for updates rather than downloading it multiple times.
 
1) I've not seen a standby mode on the VIA1535TM?

2) As far as I can tell other than the application itself MyDrive Connect doesn't store files on my computer.
 
To put your device to sleep, press and release the power button.
It is the Mydrive connect cache that must be cleared.
 
2) As far as I can tell other than the application itself MyDrive Connect doesn't store files on my computer.
Guessing you've never looked at MyDrive Connect's settings, then?

Settings.jpg
 
1) Hard to tell when or if I put the gps to sleep or turned it off when depressing the on/off button the same way I would more or less when turning it off. The only way I can tell the gps was in sleep mode is that it doesn't take as long to depress the on/off button to turn the gps on. It does find the satellites faster. Does the battery discharge in sleep mode?

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2) I've seen the file path before:

C:/Users/ABC/AppData/Local/TomTom/HOME3/cache

As the destination folder in the path was "cache" I thought it was a temp folder and not a download folder where files downloaded to the gps were stored.

The cache folder contains a file named cache-status.xml and multiple files named content (1,2,3..etc) and response (1,2,3.. etc) with either no extension or md5 or md5x extensions. Are you saying all of these files should be deleted?

Thank You.
 
1) Hard to tell when or if I put the gps to sleep or turned it off when depressing the on/off button the same way I would more or less when turning it off. The only way I can tell the gps was in sleep mode is that it doesn't take as long to depress the on/off button to turn the gps on. It does find the satellites faster. Does the battery discharge in sleep mode?

----------------------------------------------------------------------------------------------------

2) I've seen the file path before:

C:/Users/ABC/AppData/Local/TomTom/HOME3/cache

As the destination folder in the path was "cache" I thought it was a temp folder and not a download folder where files downloaded to the gps were stored.

The cache folder contains a file named cache-status.xml and multiple files named content (1,2,3..etc) and response (1,2,3.. etc) with either no extension or md5 or md5x extensions. Are you saying all of these files should be deleted?

Thank You.
Once used to update the device, yes. Map updates, especially, can plug up a lot of disk space there over time. These files aren't deleted after the update is completed to the device. That's why there's a button to purge that folder, though you don't get any positive feedback that it actually happened.

The cache-status.xml file shows the entire history of what's been downloaded from TomTom.
 
Does the battery discharge in sleep mode?
A very little discharge in Sleep, yes... but that's a pretty old battery, so don't know how long it will hold up in that state, even at low current draw. It does speed up the startup, though, since it doesn't have to boot all the way from zero.
 
A very little discharge in Sleep, yes... but that's a pretty old battery, so don't know how long it will hold up in that state, even at low current draw. It does speed up the startup, though, since it doesn't have to boot all the way from zero.

Thanks for you help.
 
Once used to update the device, yes. Map updates, especially, can plug up a lot of disk space there over time. These files aren't deleted after the update is completed to the device. That's why there's a button to purge that folder, though you don't get any positive feedback that it actually happened.

The cache-status.xml file shows the entire history of what's been downloaded from TomTom.
I didn't even see the delete button until you mentioned it just now.

Thx.
 

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