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.

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Related content

Opinion Scientific Fact: The ‘traditional’ understanding of the ship’s pivot point is wrong!

by Tim Cummins, Harbour Pilot, Portsmouth International Port - published on 9 July 2020

In fact, the pivot point that we “see” is a trick of the eye, it looks like the ship is rotating about this point but in fact it is elsewhere, a point that you cannot see.

Opinion Example of a passage and berthing plan

by Marine-Pilots.com - published on 19 June 2020

As part of a good Master-Pilot exchange (MPX) the passage plan and berthing plan is discussed with the bridge team.

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Opinion A Corrected Version on Positioning of Pivot Point

by Capt. Santosha K. Nayak - published on 18 November 2020

Understanding the fundamentals of the pivot point is highly required for understanding the alteration of the courses. Pivot point is an imaginary point on the vessel which turns on a circular path on the perimeter of vessel’s turning circle when the vessel makes a turn. The knowledge about the position of the pivot point in a manoeuvring situation provides the ship handler with the information on the geometry of motion of the ship.

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Video EfficientFlow final conference June 4 2021

published on 10 June 2021

Project results in detail. Efficient port flow using the Port Activity App in the ports of Gävle and Rauma. Sharing time stamps making planning easier for all involved actors. Efficient ship Flow by using a Route distribution service helping pilots better plan meeting points in narrow fairways, saving some fuel but more importantly increasing safety.

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Video Operation of POD Ships - Discussion on Efficiency comparing Conventional and IN-OUT POD strategy

published on 8 June 2022

In this movie the efficiency of two different pod operation strategies is compared: With azimuth propeller ships the Pods can be used in two ways to control the speed, e.g. for speed reduction: 1. by adjusting the engine orders, e.g. by reducing the RPMs to get lower speed - this means to drive the ship in the same conventional way as for twin screw vessels, 2. by turning both pods either in- or outward (TOE-IN or TOE-OUT) to reduce the forward thrust and therefore reducing the speed – the...

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Opinion Pilot Ladder - The Weakest Link in Marine Pilotage

by Capt. Santosha K. Nayak - published on 10 August 2020

Pilot transfer arrangement is a sensitive topic to be discussed among the pilot’s fraternity. Although ships are designed and operated with compliance to the SOLAS requirements in all respects including the pilot transfer arrangements, there has been numerous deficiencies observed related to pilot transfer arrangements. The small deficiencies from the part of ships cause life threatening accidents for pilots and sometimes to the ship staff themselves. There are many instances of defective ladder and complacency in proper rigging of ladders has been reported almost every day in different parts of the world. Many pilots lost their life, severely injured for life and face many minor to major accidents. The latest incident being the Capt. Timothy Murray of Sandy hooks Pilot.

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Video Safe Passage in The Singapore Strait - Eastbound

published on 11 July 2020

Safe Passage in The Singapore Strait is a training package of two videos and an Interactive computer-based learning module produced by the maritime authorities of Indonesia, Malaysia and Singapore. The aim is to improve safe navigation in the Strait. It is distributed free of charge worldwide. Copyright is with the Maritime and Port Authority of Singapore (c) 2016.

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Video Wind Balance on straight track with theory

published on 24 November 2020

Wind Balance on straight track - using SAMMON to learn the theory and the effect of rudder and drift to reach the balance in steady state equilibrium conditions on straight track. Limits of steerability will be shown and how turn under strong wind.

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Video Montevideo Pilot boat.

published on 14 January 2022

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Article Update: "Strength of Pilot Ladders and Intermediate Securing of Pilot Ladders"

by Capt. Troy Evans - published on 2 November 2020

An investigation into actual strength of ladders and intermediate securing methods used.
Capt. and Marine Pilot Troy Evans (New Zealand) decided to look into pilot ladder strength and intermediate securing arrangements after MNZ put out what he felt was a confusing and unclear document about securing of pilot ladders.

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