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How GPS works? Trilateration explained


published on 4 July 2019 -  184 -

How GPS works? Trilateration explained
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Article GPS (Part 1) - Structure, mode of operation, technical and physical fundamentals of GPS

by Capt. Gunter Schütze, Thailand/Germany - published on 30 January 2020

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.

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Article GPS (Part 2), physical and technical errors of GNSS - an error analysis

by Capt. Gunter Schütze, Thailand/Germany - published on 26 February 2020

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,

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Article GPS (Part 3) - Accidental interferences and intended Interferences by extern technical sytems

by Capt. Gunter Schütze, Thailand/Germany - published on 6 May 2020

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

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Video Electronic charts: S-100 Essential tool for marine pilots

published on 21 June 2021

Who knows the S-100 / S-102 electronic card standard? An introduction by the Maritime Simulation and Resource Centre, Canada

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Video Columbia River Bar Pilots conduct man overboard training

published on 28 April 2026

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

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Video OMC International DUKC® - Port of Melbourne

published on 14 October 2019

Footage of deep tanker Felicity navigating through the treacherous waters of the Port Philip Heads channel entrance.

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Video Simplified Vector Approach for POD forces – samples and limitations

published on 23 February 2022

This movie belongs to the operation of ships with POD propellers and discusses the approach for using a vector model from only the pods’ thrust forces as resulting force to imagine the potential effect of the pods on manoeuvring motion.

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Video Pilots Training in Brazil

published on 24 June 2022

Operators and supervisors of the operations center (atalaia) of Praticagem da Barra do Rio Grande participated in an update course in online and face-to-face mode. They had classes on nautical charts, electronic charts (ECDIS), radars, portable pilot units (portable electronic navigation equipment) and technical English. "There is no good operation without recurrent training with good tools", says pilotage operational director, practical Bernardo Ramos

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Article Ship Report Podcasts: Pilot boats - a special breed

published on 6 November 2021

Today a look at a special vessel that is commonly seen on the Astoria waterfront: the pilot boat that takes pilots to and from passing ships.

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Video DFDS Pilot transfer

published on 29 October 2025

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