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Here is some help when finding puzzle caches. After you solve the puzzle you can enter your new coordinates to the cache page on Geocaching.com. When you do this, the corrected final coordinates will be used when transferring the cache to your GPSr or in your pocket queries. The way to do this is to click on the little pencil next to the posted coordinates. It looks kind of like one of these: 
Doing so will bring up a dialog box where you can enter the new coordinates. You enter the coordinates, submit and the new coordinates will show in italics so you know they're changed. The cache icon on the maps on the cache page will also change to reflect your updated coordinates. It's a huge timesaver over manually entering a new waypoint or changing coordinates later in your GPSr.
You can check your answers for this puzzle on GeoChecker.com.