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GPSout RMC message gives Heading rather than Track made Good


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Peter

I have a new issue with GPSout. We are using the RMC message for the position, ground speed and the Track Made Good, however the TMG is outputting Heading rather than TMG as the RMC message is supposed to do. As a result any rudder input changes the direction of the flight path.

Can this be change or is there another message that can output TMG that we can use?

By the way, the last topic I had with you for my external switches is solved by using FlightSim's control stick and putting on our own Grip with the switches attached, thanks for you help.

Reg

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We are using the RMC message for the position, ground speed and the Track Made Good, however the TMG is outputting Heading rather than TMG as the RMC message is supposed to do.

What version of GPSout are you using? That was changed a long long time ago!

Track (TRUE) is provided in RMA, RMC and VTG

Heading (MAG) is provided in VTG

Track (MAG) is provided in AV400

In Fs2002 and before the track has to be computed from heading, ground speed and wind vectors, so it may not be so accurate. In FS2004 GPSout obtains it from the GPS values -- the track will be the same as that shown in FS's own GPS.

Regards,

Pete

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Pete

The version is 2.6.0.1 November 25th 2005.

When using this the values coming out vary the same as the DG on the Sim screen. In other words if I kick the rudder the TMG out of the varies immediately the same as the DG whereas the TRACK has not varied as of yet.

It is possible that the Microsoft GPS values are using the wrong output for this.

The RMC message in the real GPS world outputs TRUE TRACK, not TRUE HEADING or MAG HEADING.

Can you find this out from Microsoft?

Thanks

Reg

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  • 2 weeks later...

It is possible that the Microsoft GPS values are using the wrong output for this.

Just pull up the GPS on your FS screen and compare values. I really cannot do more than that.

The RMC message in the real GPS world outputs TRUE TRACK, not TRUE HEADING or MAG HEADING.

Yes, this is what GPSout is doing, and it gets the track from the GPS and corrects it to TRUE using the current MagVar. Early versions of GPSout did provide track computed approximately my own way -- from heading and wind vectors, but this was in error on occasion. The GPS values have given excellent service according to all those who reported the earlier discrepancies.

Regards,

Pete

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