hiking_fool

I have a puzzle cache (GC1TTMA) that is based on the coordinates that appear at the top of the Results page when one does a search for caches using a Zip Code. My understanding these coordinates mark the centroid of the Zip Code. These coordinates (for my Zip Code) have changed a couple of times this year, so I'd like to find but how often they are updated/changed. I think I've read somewhere that these coordinates are supplied by an outside source, and I'd like to find out the frequency. (I've asked Groundspeak and they sent me here.)

Sometimes it's not only the disguise, but the psychology involved. The coordinates led us to this tree, but we spent an unfruitful half-hour searching for it. A week later I realized how close we had been.. Tree Close-up of cache