This is one of nine puzzles to guide you back to your car once you’ve walked the Greensand Way
NO CACHES ARE AT THE POSTED CO-ORDINATES. DO NOT GO THERE – instead – solve this simple little puzzle

6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number. It is the result of multiplying Virgil Tracey by three, and the number of the Army Surplus Special driven by Private Meekley in Wacky Races.
You will find this cache at
North 51 (F-F)(F+3) . (F-5)(F-4)(F-5)
East 000 (F-2)(F+3) . (F-1)(F-5)(F-1)
This cache is one of a linear series of nine. You will need a map to plan your route from one cache to the next, but the paths are quite obvious