Video The difference between Gross Tonnage and Net Tonnage
published on 14 July 2020
Using pictures and sketches, this video finally explains the difference between gross tonnage (GRT) and net tonnage (NRT); the ship spaces that are included/excluded in their calculation; and the importance of these terms to ship owners.
Contents of this video will benefit mariners preparing for exams (written and oral examinations).
Video A conversation about the Jones Act
published on 13 January 2023
Article A review of the ship’s pivot point: Science, Maths and Observation’ Where is the centre of a ship’s rotation?
by Tim Cummins, Harbour Pilot, Portsmouth International Port - published on 17 July 2020
This my attempt to do just that. This is a summary of all scientific papers and articles that I could find about the ship’s pivot point. I have added links to any videos associated with the publications and have also included any useful diagrams or equations that the authors published to help explain their research.
Video Wind pure drift encounter - practical experiments for getting useful data
published on 8 July 2022
How to get information for wind & current limits to be potentially encountered by thrusters – or current? - this will be described in this movie:
- Measure Drift speed, due to beam wind with no propulsion;
- Measure drift speed using full thrusters
- Estimate wind & current limits to be potentially encountered by thrusters – or current...
- Finally there is a simple formula as Rule of Thumb: the transverse drift speed is about 7-8% of wind speed!
Video Maritime Pilot Training II - Man overboard manoeuvre
published on 12 May 2021
Article Safehaven marine supply new interceptor 48 pilot boat to Montrose port authority, Scotland
published on 29 November 2022
Video You Won’t Believe How A Pilot Boat Is Hauled Out for Refit
published on 24 September 2025
The Pacific Guardian pilot boat is first seen in Victoria Harbour near Ogden Point before making her way to Point Hope Maritime Shipyard for a full refit. This video captures the entire move process, from the cradle lowering into the harbour, to the careful docking of the vessel, to her move across the turntable and onto the spur line. Some of the footage has been sped up, since the cradle lowering and lifting are slow, deliberate operations where every movement is checked and rechecked....