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decrepit said..
So in Real speed you should have 3 main panes top left has the tracks, bottom is the speed graph and right has a whole pile of figures, if "total Dop dist" isant there, right click in that pane, select "grid fields" and tick "tot dop dist" when you scroll to the end of the file, the number displayed there will be total distance in meters, you have to shift the decimal point 2 places to get km.
You're right NM doesn't change, but the GT31 only measure once a second, so it can't do distances accurately, we have to put up with the closest it can get in whole seconds. So the faster you're going the greater the distance will vary.
That's one of the reasons the GTC doesn't have a 500m division, the percentage error there is greater.
Thanks!
It is so good to know expert help is available and you won't have to wait long for an answer.
I think the decimal point needs to be moved three places though...