Each of the 180 different caches you need to have found to qualify must be in a different British Ordnance Survey grid square as depicted on the Explorer 180 Oxford map.
These caches can be of any type, previous finds qualify (including those caches now archived and events attended - even if you were the host), in fact just about any cache other than those you have placed yourself can be counted.
For the purposes of this challenge the published co-ordinates of all caches, including Unknown/Mystery and Multi caches are the ones that are to be used when determining which square a cache is in.
From personal experience I know how time consuming it is trying to determine which of the squares of any map a cache qualifies for, although of course the British Grid reference is given at the top of each cache page just below the main co-ordinates shown in bold, as circled below.
You can check your progress at any time using the checker and when you have logged finds on the 180 caches, double-check you are eligible to claim a find on this cache; I will be using this method myself to ensure you've qualified and if not your log will be deletey without warning, you've been warned!
UPDATE August '24 - details amended to remove GSAK option now that a checker is in place (see link below).
Any Found logs submitted without qualifying will of course be deleted! Have fun!
To find out more about this and other Explorer Challenge caches, check this page, which has been created by PetersfieldPoodlePosse to complement the cache series. My thanks to them for the original Explorer Challenge idea.
Please note that the Difficulty rating for this cache reflects the work required to obtain qualifying caches, the Terrain rating relates solely to this cache.
This cache contains one of four values,
all of which you will need to access this Challenge Bonus cache.
