I hope that this puzzle doesn't make you too cross!
To find this cache solve the crossword below and then follow the instructions further down the page to get the final coordinates:

| Across |
1. Be quiet on Noah's boat for the big fish (5)
4. Change the indigenous inhabitant for a different one (11)
6. Found in the bony dark wood (5)
7. Confused Keats puts down money for a bet (5)
10. Casual worker with short tatoo charged by the Motown singing group (11)
12. Many find product without layered timber (5)
|
| Down |
1. Vertical surface hidden in scree (noun) (6)
2. Little Alan is single (5)
3. Silently Kay adds a louse to her handicraft (4)
4. Sharp-eyed say that beer is right (5)
5. First lady Not Sure if they're good odds (5)
8. Eastern meditative exercise sounds like you should tether part of a face feature (3,3)
9. Holey bread made by degrees from haircare product (5)
11. A straight fruit we hear (4)
|
Once you've solved the crossword you'll be able to calculate the coordinates. You need to take the letters from the cells marked with greek letters and use their place in the alphabet to get the solution.
For example: Imagine that the cell marked α contains the letter K. K is the 11th letter of the alphabet, so α = 11.
The final location is:
N 54° [α -3] [β -4] . [(γ / 10) -1] [δ / 7] [ε + 2]
W 001° [ζ / 6] [η - 2] . [θ - 2] [(λ -3) / 9] [μ / 5]
Try not to get your wires crossed! You can check your answers for this puzzle on GeoChecker.com.
Well done to weites55 for the FTF.