This is a simple three stage hybrid: start with a multi and end with a mystery - Just follow the clues and be ready for a rewarding phone call!
To get to the second stage:
What was the year that the world's first programmable computer (Zuze) was completed? Add the numbers of the year to a total (Z) and get the first coordinate of the second stage: N 35 57 (220+Z).
On the first stage, look to the fire station, and you'll see a commemorative plaque. Add the numbers of the year to a total (T) and get the second coordinate of the second stage: E 14 23 (322+T).
Once you get to the second stage, sit down and contemplate the sea, while you solve the riddle that is written in a hidden container (where you can also leave your TB's and trinkets). The enigma will give you the final coordinates of the cache.
Notes:
- At second stage, you'll have a path to the final stage, but please consider taking your transport (if you have) to the final point, otherwise you will have to come back (up)!
- if you are still intent on the trail, you might pass by on GC4852T, its worth the visit. Negotiate the access to the sinkhole through the north wall for an easy path.
Good luck!