This island is a British Overseas Territory, it was discovered in 1505 by a Spanish explorer and lies on the western edge of the Sargasso Sea, its capital is Hamilton.
This is an urban cache so muggle activity will be high, discretion and stealth must be observed at all times and on street parking will be a problem.
At the given co-ordinates you will find this island, convert the letters into numbers and then the tricky operation of converting them into ABCDEFGHJKL, then you will have to work out the following formula.
North ((A*B)*B) ((E*A)+B). (F) (G) (B)
East (B-A-A-G) (F-A-A) (C-D-B) (C+G). (B+G) (F) (G)