A collective noun is a word used to define a group of objects, where objects can be people, animals, inanimate objects, anything really. Sometimes a term will apply only in a certain context. A group of geese on the ground is referred to as a 'gaggle of geese' while a 'skein of geese' refers to them in flight. It is acknowledged that the lesser-known words of this type are not needed for practical purposes. However, the coining of collective nouns remains commonplace among writers eg a bench of magistrates, an expectation of midwives, a clique of photographers, and so on.
So what do you seek? A copse of trees? A cluster of roundabouts? A row of houses? A confusion of road signs, perhaps?
Simply replace the final three digits of the listed co-ordinates, both south & east, to reveal the cache’s true location. Hoping for a hint? OK...the solve has absolutely nothing to do with birds, animals or collective nouns ... keep looking or just phone a friend :-)
