PHP script fpr mileage tracking?

Question

I'd like to have pathtags made for a group. I want them to be able to use the serial number on the back of the tag to track their mileage as they travel. similar to geoaching travel bugs but using town zip codes instead of geocaches. I'd like them to be able to see their mileage compared to others. Is there a mapping utility out there that already does it, or how complicated would it be to write? Please don't answer unless you have a suggestion.

Answer 1

I found an online utility that provides distances between two zip codes. So assuming you already have the framework to track where a particular tag has been...just have the user input the current zip code and viola, you have the distance from the last entry. Keep a running total of all those distances and you have the total mileage. Then you could have a summary page with all the tags listed by total distance.

The zip code to zip code utility is:

http://www.melissadata.com/Lookups/zipdistance.asp