Hey guys,

I don't want the code, but would like to generally get an idea of how this works.

You know how when you search for a car, it asks for your zip code? And then it allows you to choose 5 miles radius from you? 10 miles, 20 miles etc...

I was just thinking, how exactly does that work? Say you live in Beverly Hills 90210.

So now I have an account profile that shows your postal code is 90210.

I can have another table called "locations" that would have the 90210 zip code too, but that wouldn't necessarily tell me if those locations were 1, 5 10, 30 miles near me...

So what is the "design" algorithm for displaying radius?
Is this something where I have to use Google's map API to do some fancy calculation? (i'm not sure google's map api even exist, just theorizing)