ABSTRACT: GPS signal jamming and spoofing have been known for decades, yet an increasing number of electronic devices rely heavily on GPS positioning. In recent years, this issue has been experienced firsthand in Poland and on Polish Territorial Waters, but in some other parts of the world, the problem has been known for much longer. Several alternative global range positioning systems have been developed, but none are as commonly used as GPS. Most ships navigating international waters are equipped only with GPS/DGPS receivers and do not carry receivers for other positioning systems. It is crucial to ensure that young navigators are appropriately trained in the navigation process using sources of position other than GPS, especially in crowded territorial waters and port approaches. Each year, the research vessel “Horyzont II” takes groups of students from the Maritime University in Gdynia on board for a few weeks of practice in manoeuvring, navigation, and radar operation. Students have the opportunity to apply their theoretical knowledge gained over 2,5 years of study. Under the supervision of the ship’s crew and teachers, they perform duties as officers, helmsmen, lookouts, radar and ECDIS operators. They also learn about daily vessel operations and participate in maintenance tasks. This article aims to present examples of GPS signal issues encountered during this year's training in the Gulf of Gdansk, their impact on equipment, the students' reactions, and their capacity to carry out efficient and safe navigation under these specific circumstances.

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