The cache is not a the given coordinates. In order to find the cache you will need to help Igglepigle solve the puzzle in the night garden.
"The night is black, and the stars are bright, and the sea is dark and deep. And someone I know is safe and snug and the're drifting off to sleep. Round and round, a little boat no bigger than your hand, out on the ocean far away from land. Take the little sail down, light the little light. This is the Way to the garden of the night"
Iglepiggle looks up every night from his boat. Tonight he found:
A Mountain, a Compas, the south pole, A Ram, Seven sisters An Altar, A Plough, A Herdsman, A Small Triangle and a Charioteer
