Please note, this is a new version of this puzzle. If you've solved the previous version you will need to solve it again. If you've found the previous version, likewise, only you'll have a new cache to go find! The final location is significantly different, the principle behind the puzzle remains the same.
Firstly, in order to solve this cache you need to decode the puzzle below. N52 and W0 can be assumed.
You are looking for a nano. Please bring your own pen.
Please make an educated decision about the level of muggle activity when you arrive at GZ, and if you find it's just too muggly, we'd suggest you return another time - we'd rather you protected the cache. We'd strongly advise you to check the hint to enable quick finding of the cache. Thank you.