Where is Admiral Leonard on HorseIsle?

He's on Starfish Isle and here is his quest:

Admiral Leonard's Sextant (25qp) [Novice]

Begins: Admiral Leonard, Starfish Isle

Items Needed: None

Admiral Leonard has lost his sextant. Head north west and use your magnifying glass on the rocks there. Return to Admiral Leoanard.

Reward: $2000