When sailing a voyage in the Eastern Seas, any monsters in the 'path you are sailing' in the Western seas appear dead when you sail through that tile and vice versa. When sailing through a path that has a monster on the other map, that monster will be battling an invisible ship. This problem has been observed in the below thread but the cause has not been identified there. http://forum.plunderpirates.com/index.php?threads/dead-ship-on-other-map.10118/ Here you go @c00ni