Destinator GPS receiver won't work wit TOMTOM NAV 5

Sanstorm · Occasional Visitor Joined: Jan 13, 2005 Posts: 3

Hi Everyone,
I have just Upgraded TTN3 to TTN5 on HP Jornada 568 PDA and found that my original Destinator wired GPS receiver does not work with TTN5. I keep getting a 'No GPS Detected' message.
This is despite the fact, that I have used this GPS module with Destinator 3.0.64 & TTN3.07 with absolutely no problems at all in the past.

I have tried various connection methods the most obvious choice being 'Other Cable NMEA GPS' in TTN5 GPS setup @ 19200bps & others @ serial com port1.

None of the variants have worked as yet. Does anyone have any ideas? I have seen some Guys have mentioned editing the PDA registry on other Forums.

Even though TOMTOM state that this GPS receiver is supported by TTN5, One thing I have noticed is that the receiver previously used a setting in Destinator and TTN3 of Com1 19200bps and SiRF protocol not NMEA.
There does not seem to be a setting for SiRF protocol in TTN5 unless I am missing something?!? maybe it is a standard protocol in TTN5, however, it seems strange that no specific mention of SiRF is made in the setup.
I have emailed TT support and am awaiting a response!

If this does not work does anyone know of a good wired GPS receiver to use with the HP Jornada 568 PDA and TTN5

Thank you

Sanstorm
Rolling Eyes

lbendlin · Posted: Thu Jul 07, 2005 10:17 pm Post subject:

you have the finger on the wound - the receiver is set to SIRF protocol but TTN5 only understands NMEA. You need to reprogram the receiver.
_________________
Lutz

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Sanstorm · Occasional Visitor Joined: Jan 13, 2005 Posts: 3

Hi Everyone
Good news! Thanks to good old Google I was able to locate a reasonable explanation to the problem at this site: http://www.pocketgpsworld.com/winfastnavigatorppc.php

It was a protocol problem as Ibendlin mentioned in his post.....spot on mate!

Apparently TTN5 does not recognise or use the SiRF protocol but uses NMEA protocol. Which is a shame! As I understand, the SiRF protocol has a faster data transfer speed e.g. 19200bps instead of the NMEA's 4800bps.
The higher transfer speed allows for buffering of the data and releases CPU resources and a spin-off to that is better multi-tasking and cooler running PDA.

From the link above I was able to download Winfast Navigator software and use it to check the operation and settings of the GPS module and after some nail biting moments re-program it from the SiRF (19200bps Crying or Very sad

) protocol to the much (s)lower NMEA (4800bps).
Problem is it shows that the data transfer is slower because now it tells me to turn while I am actually taking the turn, whereas TTN3 running with SiRF 19200bps would tell me a good 50m before the turn!?!!?! Not Good!
Anyway thanks again Ibendlin for you reply and I will have to monitor performance of TTN5.

Sanstorm Laughing

lbendlin · Posted: Fri Jul 08, 2005 12:49 am Post subject:

you can set NMEA to any speed you like. But you will see NO performance difference. Sirf (as well as higher baud rates) only allow the processor to wait faster.
_________________
Lutz

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TomTom/TeleAtlas NAVTEQ

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