Stage 1
Posted coordinates will take you to a purple sign. You need the two main words (grapes on both sides) to caclulate the next stage coordinates. Using A=1,B=2,C=3, etc, add up the numbers for the first word and subtract 46.962 to fill in the coordinate for 42 13._ _ _. Using the same proceedure, take the sum of the second word and subtract 44.607 to fill in the coordinate for 085 53._ _ _.
Stage 2
You are looking for a building erection date (not 1901) and add up the four individual numbers. Take the sum of the 4 numbers and subtract 20.214 to fill in the cache coordinates of 42 12._ _ _. Using the same sum of the four numbers, multiply that number by 3.14(pi) and subtract 65.482 to find the cache coordinates for 085 53._ _ _.
Stage 3
This will take you to the cache. Parking is available nearby on all stages. Cache size only accomidates logbook and pencil.