THE CACHE IS NOT AT THE LISTED COORDINATES  but you might park there.

Introduction

The Abbot of my order, หลวงปู่แจกันอันอุดมด้วยธรรม ^[1],  lives in a forest temple and needs a way to talk to the neighbouring abbots during the rainy season, when there is no electricity and he can't leave the temple. So he has devised a sort of semaphore: it's a magic mandala with seven different coloured tiles which rotate to make messages. Unfortunately, sometimes the novice who sets up the tiles has other things (or maybe nothing) on his mind and puts a tile the wrong way round. The Abbot says that is only to be expected in this Wonderland of illusion, but he can work out which tile was wrong and correct it. I didn't quite understand his explanation, which was all about avian payments^[2] and a lyric poem about a river junction ^[3], but he says understanding is illusion too, and it works whether you understand it or not. He calls this ENlightenment, but I think Error Correcting Colour Code would be a better name.

The code

This table shows the colour symbols that represent Numbers 0 to 15, though we don't need all of them here. If you see any other symbol, there has been an Error and you are in a state of illusion, which must be corrected.

So how can we decode a message if there are errors? The Abbot says that to achieve ENlightenment, you must first mindfully detect the errors, one symbol at a time, and correct them, like this: In each symbol, count the total number of red, green and blue tiles in it, not forgetting that all the other colours are made by combining those three as shown in the figure below (for example, symbol 1 above has two reds and two greens, because yellow is both red and green). If any total is an odd number, there is error. To find it, first set E to 0. If the red total is odd, add 1 to E; if the green total is odd, add 2; if the blue total is odd, add 4. If E is zero, the pattern is correct. If it's not, E is the nimber (1-7) of the tile that's in error, so correct the error by rotating that tile. Now there is no illusion you can complete your ENlightenment and find N by looking up the corrected pattern in the Abbot's table (or just add up the tiles: 1 for a yellow tile, 2 for magenta, 4 for cyan, 8 for white.)

Key

Here's a helpful diagram which shows

• How to combine colours when counting tiles
• Number to add to E if its colour has an odd total
• Number to add to N if its colour is showing

The final location

Mindfully decode the following Numbers and Errors to find the coordinates.

Footnotes

^[1] His title means "vessel filled with wisdom" or "Dharma-rich Ming" (7, 7).

^[2] parroty cheques.

^[3]  a Severn-fork ode.