I'm not sure what's wrong, then. Doing that trick of writing the locators to a text file, reading them into the model file, then viewing the result with GM Viewer, I can see your locator close by the port side of the deck. Differences I can see between this and the locators which @Pieter Boelen put into "RESOURCE\MODELS\Locations\Decks\udeck2\udeck_ld.gm" to add places for a ship to appear near "ShipDeck3":
- Those in "udeck2" are have group names "ships" and "ships_other", whereas yours are "Ships" and "Ships_Other". I wouldn't have expected capitals to make any difference, but I'm not sure about locator names.
- The locators in "udeck2" have different co-ordinates. "ships_other\ship_1" is a lot further astern than "ships\ship_1". I'm guessing that the ship should appear on "ships_other\ship_1" and, if the "sailaway" attribute for the character is set, it will move towards "ships\ship_1". Certainly that's what the Interceptor does in the "Jack Sparrow" storyline - starts off astern from you and moves alongside. Your locators have the same co-ordinates, so if that is how ship movement works then the Flying Dutchman isn't going to move, as it starts and finishes in the same place. Whether that prevents it from appearing in the first place, I've no idea.