Some times "good enough for jazz" applies I solved a similar problem - find all geo locations within 2 hours driving time of x,y I basically used the great ci

Some times "good enough for jazz" applies I solved a similar problem - find all geo locations within 2 hours driving time of x,y I basically used the great circle distance (using I think a CPAN module) as an approximation - this was for geotargeting AdWords.