Tomtom BT Receiver Protocols

[nwaring]

Hi,



I have just received my new tomtom BT receiver (and very impressive it is too). I works fine with a quick fix etc.



I have read much about NMEA, SIRF WAAS etc. but am a bit lost as to what the receiver can do!



I know it works on NMEA protocol (using Leadtek GPS monitor on the laptop) but it doesn't seem to work if I select SIRF protocol... Is this something it should do?



I will be using it with TT Nav v2 and am also unsure as to:

... whether the TT software uses the SIRF protocol?

... or whether I souldn't really care as it all works,

... or whether it doesn't make a difference anyway,

... or whether it's only the communication between GPS unit & laptop/pda that uses the SIRF protocol??

... or is it the comms between the satelites & the GPS unit that uses SIRF

... and the manual says it has a SIRF chipset??



I guess it's all a little unclear so any advice welcome



Thanks



Nick

[Dave]

The receiver will work in SiRF mode, although I haven't tried it, I believe it works on SiRF 4800 COM8. You won't notice a lot of difference with SiRF, apart from you will get position updates more frequently which can cause more of an issue when signal drops for a fraction of a second because it will keep beeping away saying it hasn't got a 3D fix.

[nwaring]

Thanks dave,



Is the baud rate of 4800 OK with the buluetooth connection between the iPAQ & GPS?... the following link implies that it can cause problems http://www.gpspassion.com/Hardware/Reviews/BluetoothGPS.htm



Nick

[Dave]

There were known problems with Emtacs and bluetooth switching from 4800 NMEA to another baudrate under SiRF would lock you out of the Bluetooth GPS, a fix for this was to switch from NMEA to SiRF on the same baud rate before changing to a different baud rate. AFAIK, I don't think it's a problem on the TomTom BT GPS.

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