What do the blue dive dice show, and what does a dolphin tile replacement mean?

Question

Accepted Answer

One blue die picks what moves: dolphin, shark, whale, sea serpent, unoccupied boat, or a starfish (wild, your choice). The other sets the maximum distance: 1, 1, 2, 2, 3 or D, and D lets that creature or boat go to any unoccupied sea space. The terrain tile showing a whale with a 3 arrow becomes a dolphin tile: reveal it, place a dolphin on its space, and remove the tile.

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What do the blue dive dice show, and what does a dolphin tile replacement mean?