Google Earth mapping and GPS have elevation measurements built in when using our technical software. Scale measurements are extremely accurate when using Google and Bing with licensed software programs.
The ongoing discussions query accuracy. My point is the methodology and accuracy is down to how accurate you want to be and how you use technology. Simple. Personally I just fuel it and drive now and don't care.Please can you elaborate, I can't see what point you are trying to make here?
The gps info on my VW sat nav shows elevation, it constantly updates it so could take it into account possibly?But gps will only measure the distance across the ground & take no account of elevation changes, Ok in Norfolk but makes a difference in the Alps.
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