This cache series is being extended and was originally developed by Maryland cacher mdsurveyor. With his kind permission and help, I am continuing the concept.
The posted coordinates are for the Post Office. The cache is NOT in or next to the building. The cache will be within walking distance or only a short drive from the Post Office.
A simple puzzle once you learn how to apply the sets of three numbers for the cache and some simple math .
To find the cache location, use the (Grid:Row:Column) format:
Grid:
When you enter the Post Office you will find multiple walls with post office boxes. The Grid refers to ALL of the groups of boxes on any particular wall. Each wall of boxes is considered a separate Grid and there is only one Grid per wall.
The Grid number is determined by the number of the P.O. Box in the upper right-hand corner of the Grid. Find the P.O. Box number that matches the Grid number and you are standing in front of the Grid you need to use.
A Grid has rows of boxes that run from left to right and columns that run from top to bottom. The P.O. Boxes at the bottom of the grid are usually bigger than the boxes at the top. The rows will normally lineup across the entire grid, but the columns will not. There will be more columns on the top of the Grid and less along the bottom of the Grid.
Row:
Starting at the upper left corner of the Grid and counting from top to bottom, the top Row is 1 the next Row down is 2 and continuing on to the bottom of the Grid.
Column:
Counting from left to right, the leftmost box is Column 1 and the next box from the left is Column 2 and continuing on to the right of the Grid. Warning, Row 1 will probably have more Columns than Row 9, so be sure to be counting across in the correct row (That is why I gave you the Row number before the Column number).
N 42° 47.{(G471:R4:C17) + (G911:R9:C8)} .
W 077° 49.{(G911:R4:C5) - (G471:R8:C22)}
I verified that the P.O. Box lobby is open 24/7.
BYOP.
You can check your answers for this puzzle on GeoChecker.com.
Congratulations to the Malone family for the FTF!