I'm not sure which forum this should go in, but since I'm a new user, I guess this will do.

I wrote an iPhone app that can quickly and easily read the serial number off of canadian dollar bills. I want to add the ability to post at Canadian Money Tracker. I automatically have all the information needed for the 'add note' page, except for the postal code. I do have the gps coordinates though, but I can't find an easy way to convert from gps to postal code.

There's places that sell postal code maps, but when I release the app, its going to be free, so I can't justify paying for the maps. I'm hoping someone on this site adds notes often enough that they've found either some way of entering gps coordinates here or easily finding the postal code of a given set of gps coordinates.

Thanks,

John