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Falkien Occasional Visitor
Joined: Jul 14, 2004 Posts: 48
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Posted: Wed Jan 05, 2005 6:21 pm Post subject: TomTom BT GPS Reciever Chipsets |
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I purchased a TomTom for Palm BT set last March and it's been working well since the last update.
On the bottom of my BT GPS receiver it has a a little E 24 logo - Is this and indication of the GPS chipset it uses?
This week I purchased a new Palm BT set for my Father-in-Law and his BT GPS receiver has a Sirf Xtrac2 logo on the bottom.
The new receiver is much quicker to get a position from cold and is even getting a 4 satelite lock indoors! Whereas mine will not even find one Sat signal
It looks like TomTom have upgraded the chipset used since I bought mine
It's good news for anyone considering the TomTom BT option
Dave |
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DavidW Pocket GPS Moderator
Joined: 17/05/2003 02:26:21 Posts: 3747 Location: Bedfordshire, UK
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Posted: Wed Jan 05, 2005 11:04 pm Post subject: |
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The E24 logo, especially if it's circular, is to do with EU approval for in car use.
All the TomTom Bluetooth GPSes are SiRFstar IIe/LP based; yours clearly is running standard SiRF firmware (known as GSW2). Your father's unit is running SiRF XTrac II firmware.
The differences have been mentioned various times in the forums; XTrac will work with poorer signals, but the compromise is that there's a few features in GSW2 that aren't in XTrac II (particularly support for SBAS - WAAS and EGNOS), and some people have found XTrac II firmware gives inaccurate positions in some circumstances, (the one that's been mentioned is when walking when the GPS has a poor view of the sky).
For in-car use, XTrac II seems fine (unlike the original XTrac, which tended to show a position lag in-car).
David |
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Falkien Occasional Visitor
Joined: Jul 14, 2004 Posts: 48
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Posted: Thu Jan 06, 2005 2:36 pm Post subject: |
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Thanks David
interesting, I guess it's just chance my XTrac reciever couldn't find any signals in the same location that the XtracII found 4 good ones
I don't suppose the firmware is 'downloadable' or reprogramable in any way?
I'm an Electronics Engineer, and I've been itching to take the unit apart since I got it ;-)
Dave |
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