Hi, I have just bought a GT-31 to go with the existing GT-11 and I can't seem to figure out how you know what are doppler and what are trackpoint measurements.

Is the difference when recording the data, or is it when interpreted in RealSpeed?

Is there a guide somewhere that describes how to show the doppler data, assuming that what I am seeing is trackpoint?

I have set it up as per Tom's GT-31 guide, but I don't really know when or how doppler is used. I couldn't find the answer when searching the forum but feel free to point out an obvious answer!

Also, this GPS seems to not read over 29 knots. Is this a known firmware bug?

Mine won't even get that high
It's in the settings in RealSpeed where you can choose Doppler in the
division settings.

GT31 and BGT31 measuring only in doppler. There is no setting to switch between trackpoints and doppler. So if you have GT or BGT 31 all that you have is doppler

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wkcwarrior said...

GT31 and BGT31 measuring only in doppler. There is no setting to switch between trackpoints and doppler. So if you have GT or BGT 31 all that you have is doppler

I think you're wrong here warrior. I think trackpoint and doppler data is recorded to both the card and data logger. What you use depends on how you set up the computer program you use to analyse the data.

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wkcwarrior said...

GT31 and BGT31 measuring only in doppler. There is no setting to switch between trackpoints and doppler. So if you have GT or BGT 31 all that you have is doppler

This is not correct.

As Decrepit said, the GT31 and BGT31 (as well as the GT11) record both trackpoints and doppler.

This allows you to get Realspeed to calculate based on either method.

For 2010 in the GTC, all results should be calculated using "Doppler if available" for all categories.

Thanks guys.

I guess I missed where the option to use Doppler was, as I was using the pre-configured version of RealSpeed with both a Garmin and a Gt-11. This had the divisions already set up, so I didn't need to look at the way they were configured.

When I opened the other pre-configured version it showed the difference between the GT-11/trackpoint alphas and the GT-31/doppler alphas. When I looked at the categories/divisions, they are already set up for 'doppler if available'.

In the end, the divisions were set for 'doppler if available' in the first version of RealSpeed that I used (Garmin pre-configured) anyway, so all my results would have used doppler when it could.

Thanks again.

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nebbian said...

wkcwarrior said...

GT31 and BGT31 measuring only in doppler. There is no setting to switch between trackpoints and doppler. So if you have GT or BGT 31 all that you have is doppler

This is not correct.

As Decrepit said, the GT31 and BGT31 (as well as the GT11) record both trackpoints and doppler.

This allows you to get Realspeed to calculate based on either method.

For 2010 in the GTC, all results should be calculated using "Doppler if available" for all categories.

Yes Neb, but GPS Results calculate Doppler in default with GT31 so there is no need to switch to trackpoints

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nebbian said...

wkcwarrior said...

GT31 and BGT31 measuring only in doppler. There is no setting to switch between trackpoints and doppler. So if you have GT or BGT 31 all that you have is doppler

This is not correct.

As Decrepit said, the GT31 and BGT31 (as well as the GT11) record both trackpoints and doppler.

This allows you to get Realspeed to calculate based on either method.

For 2010 in the GTC, all results should be calculated using "Doppler if available" for all categories.

yes but gps result calculate doppler in default so there is no need to switch to T

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wkcwarrior said...
>>>>

yes but gps result calculate doppler in default so there is no need to switch to T

Yes but not very many of us in Aus use GPSresults, RealSpeed is what most of us use.