These foreign-registered vessels fly the flag of the country in which they are registered and the country of their destination when entering a harbor, thus avoiding the problem of the national flag of the PRC entering Kaohsiung Harbor or that of the ROC entering a PRC port.
權宜輪進港時掛的是註冊國國旗和目的港國旗，可以避開五星旗進高雄港，以及青天白日滿地紅在對岸出現的難題。