THE CACHE IS NOT AT THE POSTED COORDINATES
The posted coordinates are for the Portlock Post Office.
The cache is NOT in or near the building.
To solve this field puzzle you will need to go inside the Portlock Post Office.
GRID:ROW:COLUMN
GRID
All of the groups of boxes on any particular wall.
The Portlock Post Office has only Two walls of Post Boxes.
This post office has Two Grids.
ROW
Start at the upper left corner of the Grid.
Count Top to Bottom.
COLUMN
Start at the upper left corner of the Grid.
Count from Left to Right.
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NOTE: Row 1 will probably have more Columns than Row 9.
That is why it is important to use the GRID:ROW:COLUMN format.
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Find the 4 Boxes to Solve for A, B, C & D
N 36 47. A W 076 16. BCD
A = Last 3 Numbers G7581:R1:C10
B = Third Number G7781:R3:C12
C = Last Number G7781:R5:C2
D = Third Number G7781:R4:C10
Sum Check: A + B + C + D = 280
This cache is based on a concept initiated by geocacher MDSurveyor (MD)
GC1BF0T P.O. Box – Bel Air