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 book was only available in some areas, now the author has created an e-book version. Furthermore it´s available on amazon as a paperback.

Completely new book on Ship manoeuvring techniques based on new revealing facts which have been brought to light. Must read for all the mariners to understand the behaviour of ships and how to control her behaviour during manoeuvring.

Training video IV on the correct behaviour in case of man overboard

Gavin Buchanan on YouTube: "Some of the best Ship Handling videos available online. Studying for my Master 3000 and have found these videos incredibly helpful. Thank you for making these free for students!"

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

Shipping has evolved significantly over the years. Research in maritime safety and operations over the past few decades has been intensive and has resulted in significant improvements.

🚤 Safety at sea starts with preparation. Our Marine Operations team recently carried out a live Man Overboard (MOB) drill using the new recovery platform on our pilot boat, Trais Leopard. Regular training exercises help ensure our equipment, procedures and crews are ready to respond effectively in an emergency. These drills are a vital part of maintaining the highest standards of marine safety and operational readiness. ⚓ Prepared. Practised. Ready to respond. #MarineSafety #ManOverboard...

The Canadian Hydrographic Service (CHS) wishes to promote the implementation of the new S-100 standards to provide mariners with access to additional information (bathymetry, surface currents and water levels) and greater versatility in the display of these data.