You will need to go to all the waypoints to gather the info needed to get to the final.
Waypoints A – F will give you the co-ords that will put you close to the final cache position.
The Format is A B.C
You will need the WP G info to find the exact location.
Subtract 1810 from the first date.
Subtract 1880 from the year the Portico was removed.
Number of stones in circle, Multiplied by the number of birds on poles.
Number of white pavers in NZ (large and small) multiplied by 2 then subtract 2.
Divide 92 by the number that the Title of the sculpture represents.
The number represented by the 3rd, 61st & 47th alpha characters on the plaque, if Z=26, Y=25, X=24 etc.
Subtract 1661.3 from the year 'Bill' laid the stone.
All the info from the waypoints can be gathered at all times, but you will need to check opening hours for the final.
You can check your answers for this puzzle on Geochecker.com.
Thanks to Crazy Aaron for the inspiration for the cache.