Once per turn, if this ship is within S of an island, you may mark the island as explored without docking at it. The island becomes unexplored in regards to all other players. This ship ignores terrain when she is given a move action (islands are not terrain).
Captain Sweigart and his crew have measured and triangulated every island and natural terrain feature in the South China Seas. After all, you never know when you'll need to make an escape.