Where are all the anchors for Black Bart's collection on HorseIsle?

Black Bart's Collection (200qp) [Intermediate]

Begins: Black Bart, a Crossbone Pirate

Items Needed: None

Black Bart asks you to dig near old ship parts and find him 4 new anchors. These can be found on both Crossbones and Skull Isle. Look for shipwrecks along the shorelines.

Reward: 2 Diamonds, 3 Pearls