Here "a ship crossing over" stands for the crew that would sail the ship. Alternate translation: "When we found a ship with a crew sailing over to Phoenicia" (See: [[rc://en/ta/man/jit/figs-metonymy]])
Here "crossing" does not mean it was presently crossing but that it would be crossing to Phoenicia soon. Alternate translation: "a ship that would be going across the water" or "a ship that would be going"