How does GPS work?

Of course, as a Nautical Specialist, I also deal with the international discussion on the advantages and disadvantages of satellite-based navigation, e-navigation and conventional terrestrial and astronomical navigation.

In my announced sequel, the second part of GPS, it is primarily about the technical and physical operational and functional limitations to which GPS is subject. These limitations, in part, have serious implications for the accuracy of GPS, and even go as far as limiting the functionality of GPS in its functions or even making it impossible. In doing so,

The vulnerability of GNSS in shore-based use is definitely different and to be regarded as much more risky than on the high seas.

There are many things in both our everyday and professional lives which we take for granted and never question the origins of, an example of this might be the IMPA recommended ‘pilot mark or pilot line’, which is sometimes seen on the side of vessels indicating where a vessels freeboard exceeds 9 metres.

Showing the new EfficientFlow functions for the SEAiq PPU, to be used by pilots and ferry personnel in the Baltic Sea

On April 20, 2026, the Columbia River Bar Pilots conducted a MOB drill with the U.S. Coast Guard Station Astoria.

Adding map and speedometer widgets to your GoPro video clips. Tips by Capt. Kris de Decker

Researchers have observed an unexpectedly high frequency of towering waves in the German North Sea, particularly near the island of Norderney. These extreme waves pose a significant risk to maritime infrastructure, including ships, offshore wind farms, and research platforms.