Red 20 - AAND Roulette
The Milton Keynes Boundary Walk is approximately 65 miles long and follows the border of the MK Unitary Authority; it is waymarked with the Oakleaf symbol.
In 2012 a group a local geocachers divided the walk into sections and set a series of over 300 caches along the boundary. More information about the walk and caches can be found at the website Caching the Boundary.
The red section of the walk is approximately 6.5 miles long and starts at the A5 South of Aspley Heath, via Great Brickhill and ends in Newton Longville.
There are 33 caches in this section - 24 traditionals, 6 letterboxes, 1 multi, 1 puzzle and 1 bonus. Each non-bonus cache contains a number to help you find the red bonus cache which is hidden towards the middle of the red section of the walk.
The puzzle can be solved using an Aluminium Alpha-Numeric Disc (AAND). You've just got to use the clue on the cache page to work out which colour disc you need and then cross your fingers!
N 51° 58.DEA' W 000° 43.EDA'
If you've not got the correct AAND then you'll have to work it out the hard way! The cache is hidden less than 200m from published co-ordinates, just off the boundary walk. You can use the geochecker link below to confirm approximate coordinates. If you get really stuck I'm happy to offer a hint or two by email (but not until the FTF has gone!).
If you're reading this while out walking and are completely confused, don't panic! the bonus letter found in this cache is duplicated in three others, so you should still be able to find the bonus without finding this one! :)
You can check your answers for this puzzle on GeoChecker.com.