Calculating hill gradients, what's the website called?!

Hi;
I remember a thread on here somewhere a while ago about how to calculate hill gradients, and there was a link on there to a website where you could enter points on a map and it would calculate the length of the hill and gradient between the two points. Can I find either the thread on here or the website on Google? Can I censored !
Can anyone point me in the direction of the thread or know the website?
Thanks...
I remember a thread on here somewhere a while ago about how to calculate hill gradients, and there was a link on there to a website where you could enter points on a map and it would calculate the length of the hill and gradient between the two points. Can I find either the thread on here or the website on Google? Can I censored !
Can anyone point me in the direction of the thread or know the website?
Thanks...

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