NavList:

Bruce, you wrote:
"My intent was to show everyone and myself that Google Maps Distance Calculator is just excellent for all distances starting at even 100 ft or 200 ft. "

And you succeeded. Thanks for the data points.

By the way, it's interesting to consider that this ability to calculate great circle distances from very small to very large distances is now basically "built-in" on every modern computing device. I remember as recently as 15 years ago, you could still find discussions among mathematical software developers debating the best way to calculate a great circle and the best way to deal with cases where the distance is small (say, 20 feet instead of 200 miles), but now it's all "in the chipset" for the majority of modern devices. GPS chipsets apparently includes great circle distance calculation as a standard feature. Graphics processing units usually do so for angular distance. And even cell phones have this on a chip for the simple task of determining distances to cell towers. The "bottom line" is that you can expect distance calculations to be accurate and reliable on almost any platform --unless the developer has made the mistake of "rolling his own" version, in which case all bets are off.

-FER

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