How GPS works? Trilateration explained

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.

This updated video shows how easy it is to develop an arrival plan with the SAMMON Planning Tool. As a sample the arrival from appraoch until the berth to Ft. Lauderdale is used under strong current of 2kn. At the simulator training courses where we used this tool for preparation of a manoeuvring plan during the briefing sessions all nautical officers involved stated afterwards: "Why don't we have this tool on our ships?"

NAUTITEC as a maritime simulation and training centre offers various services for shipping companies, port authorities, captains and for pilots and tug crews.

This video explores the question of why ships are so difficult to manoeuvre in reverse.

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

Poseidon on the model boat pond in Vallensbæk, Denmark.
Poseidon is a pilot boat based on a kit but modified to match the real pilot boat "Poseidon". The entire super structure is scratch built with very detailed interior that this video doesn't do justice. The real boat is based in Hornbæk, Denmark. The builder has made many visits to this boat to get all the details right.
Builder and owner: Ole Bødker
Link to Vallensbæk model boat club (Danish): http://www.vallensbaekmodelskibsklub.dk

A maritime pilot, marine pilot, harbor pilot, bar pilot, or simply pilot, is a sailor who maneuvers ships through dangerous or congested waters, such as harbors or river mouths. They are navigational experts possessing knowledge of the particular waterway such as its depth, currents, and hazards.