At the given co-ordinates on the little bridge:
No of planks on the bridge surface = A
No of rails on the bridge = B
A + B = C
A - B = D
The cache is at:
N 50 AC.(A*3)(A+B+D)(C+B)
W 001 DC.(A+D)(C-D)(B*2)
In this area there is Nettlecombe the site of a deserted medieval village, and the dismantled railway that was the Isle of Wigth Central line from Merstone to Ventnor West.
The Little Bridges series was started by Stanthews in 2009 to highlight small footbridges in remote parts of Wiltshire. Since then the series has been expanded by others all over the country and starting to spread fast, Damian from Winter Foxes has created and updates a list of cachers who has found 10 or more little bridges and can be found here, if you would like to add to the series, please contact Stan on stanthews@aol.com and he will give you a number for your bridge, to qualify, the bridge must be a foot bridge too small for vehicles, please make sure your title exactly matches “Little Bridges # xx then name” including spaces so it will get picked up and added to Damian’s list.