Gdynia is the main passenger port for the three cities. It is a manufacturing centre and the home port of the Polish navy. Its chief exports are lumber, coal, and sugar, while iron ore and food products are the main imports.<ref>https://www.britannica.com/place/Gdynia</ref> | Gdynia is the main passenger port for the three cities. It is a manufacturing centre and the home port of the Polish navy. Its chief exports are lumber, coal, and sugar, while iron ore and food products are the main imports.<ref>https://www.britannica.com/place/Gdynia</ref> |