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>This on has source... Given that this one has source, I'd go with it. But for future reference, while you need sin and cos to be "technically" correct, the reality is that you usually don't need to go that far. The distance can be approximated by: ((69.1*(Lat1-Lat2))^2 + (53*(Long1-Long2))^2)^0.5 Which is trivial to do in any language. The farther apart the locations the more the error, but for most uses, and considering that in most cases Lat and Long are based on the center of a zip code, that simple formula works great. -Walden ------------ Walden H Leverich III Tech Software (516) 627-3800 x3051 WaldenL@xxxxxxxxxxxxxxx http://www.TechSoftInc.com Quiquid latine dictum sit altum viditur. (Whatever is said in Latin seems profound.)
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