Ship
A ship stands for shared fate and large undertakings. Sailing smoothly means cooperation working, and boarding a big vessel means joining something of scale. A ship loaded with cargo is a good omen of wealth. Meeting a storm, by contrast, signals a call to review a partnership or an organization, and disembarking means the time has come to step back from something you were part of.
On a ship nobody can get off partway, which is what separates it from every other vehicle. Traditional reading likened the ship to a household and a business, and read a smooth voyage favourably. Look at the state of the water alongside it.
Readings by Situation
A ship sailing smoothly
A good sign that shared work goes well. Tradition read a smooth voyage as cooperation fitting together. Calm water reads more strongly still.
Boarding a great ship
A sign of committing yourself to something large. Tradition read a great ship as a great household. Take it as being handed work of real scale.
A ship rocking or taking on water
A sign that there is a gap in the shared work. Tradition read a leaking ship as a call to look to your household. If a check has been deferred, now is the time.
Getting off a ship, or missing it
A sign of stepping out of a place you travelled together. Rather than a bad omen, read it as going separate ways. If the regret was strong, look at that feeling first.
A ship dream does not forecast a real accident. More often it is a scene about your relations with the people travelling alongside you. Rough water does not fix anything bad in place.