If a location is specified, there must be a direct route to it from the current location of the ship. The captain must have a crew to assist in the handling of the ship.
Galleys require fourteen pirates or sailors to row the ship.
Roundships require at least eight pirates or sailors to man the ship's rigging. If the required number of crew are not available, travel is still possible, but will take an extra day for each hand the crew is short. For example, a galley with only 10 men at the oars will take four extra days to travel across an ocean route. A roundship with no sailors at all would take eight extra days to traverse a route. The sail order will fail if the ship is overloaded.