Thread: Sirfstar III, what's the point???

Are you using a Car-PC with a VIA chipset?

Yes I am, Jetway C7 via chipset..

And you ask this because.......?

OK. VIA chipsets has some problems with varies USB devices when disconnecting before hibernate/shutdown.

You can actually solve the problem by hardware, instead of running software aps...
If you look at the motherboard you will find a jumper called J1 and a jumber called J3. These jumbers sets whether the USB port should allow a device to wake up the system, which means that they will keep the USB ports powered, instead of making a "hard-cut" of the power.
The difference is that the USB ports will be powered as soon as the system is turned on, instead of having an application "calling it" before use. This will make the GPS turn on immediately, so it is ready when your GPS software trying to calls it.

The jumpers are set to "disable" by default. Try to change this to "enabled" by moving jumper to pin2-3....

Originally Posted by Dougw133

So if these programs only use NMEA whats the point of Sirfstar?

Some programs do support sirf, Eg. Destinator 6/7 (Centrafuse).

Well I changed the J3 jumper and nothing seemed to change, it still had problems. I went on a long trip over the holiday and the GPS didn't work the first 100 miles. After that it worked the whole way. After shutting the system down it didn't work again. All weekend it was hit or miss. However, yesterday and today it has seemed to work ok, but taking about a minute to lock after resume. I really think it's the GPS...I ordered a BU anyways because I will be driving across country later this week.

Hmmm...Strange.
What worked for me was installing an updated USB 2.0 driver (NOT the one that windows have) and changing these 2 jumpers.
I never have problems when hibernating now. Before this the GPS disappeared EVERY time the system resterted.
Have you installed an updated USB driver?

Got my Bu-353 today and it is working beautifully. No resume problems, no problems getting a lock.