GPS question

[Blackbird]

The differences are small enough not to be noticed anyway. If you take an example of a basic trig calc of a straight road which rises 200 metres over 1 km (fairly steep), the true distance is only 19 metres longer than the plan view anyway.

[LBD]

I do notice at times on a winding road it will show a slower than actual speed because the GPS can straight line some of the bends....however in a straight line it seems to be accurate....and it concurs with those radar speeds shown on the side of the road around schools.

Another good judge of GPS accuracy is the sphinctor puckerOmeter read in conjunction with the tunnelvisionOmeter....when one is very tight and the other very narrow and your GPS looks like this.....then the GPS is probably accurate...