Cathay Pacific Asia Miles - Mileage calculator with atlas?

I remember myself using a mileage calculator website once where you key-in an origin and specify a distance in miles then it shows a circle on the atlas which entail all cities within that equidistance. Unfortunately, I can't remember it now but thought it could be very handy to determine a collection of cities where I can reach (within 1.2k, 2.5k, 5k miles, etc.) by redemption of a given Asia Miles mileage. Could you anyone let me know any website which serves that function? Many thanks

Oops.. Wrong site I was thinking of...

Great Circle Mapper:

http://gc.kls2.com/

Thanks Wilbur!

That's quite a handy site. Even though I know that HKG is 4592 miles from SYD, if I were planning a leisure trip, it's handy to have a visual of what's within, say, 3k or 5k nautical miles of SYD.

That's a link to bookmark.

cardenio98

http://gc.kls2.com/cgi-bin/gc?RANGE=XXXXnm@ZZZ replace XXXX with distance you want and ZZZ with airport code