Efficiency of a Voluntary Speed Reduction Algorithm for a Ship’s Great Circle Sailing
Paper in proceeding, 2019

The great-circle passage is the shortest distance between two points on the surface of the earth. When planning a ship’s sailing route (waypoints and forward speeds) for a specific voyage, the great circle route is commonly considered as a reference route, especially for ocean-crossing seaborne transport. During the planning process, the upcoming sea weather condition is one of the most important factors affecting the ship’s route optimization/planning results. To avoid encountering harsh conditions, conventional routing optimization algorithms, such as Isochrone method and Dynamic Programming method, have been developed/implemented to schedule a ship’s optimal routes by selecting waypoints around the great circle reference route based on the ship’s operational performances at sea. Due to large uncertainties in sea weather forecast that used as inputs of these optimization algorithms, the “optimized” routes may have worse performances than the traditional great circle sailing. In addition, some shipping companies are still sailing in or making charting contracts based on the great circle routes. Therefore, in this study, a new optimization algorithm is proposed to consider the voluntary speed reduction with optimal speed configuration along the great circle course. The efficiency of this method is investigated by comparing these two methods for optimal route planning with respect to ETA and minimum fuel consumption. A container ship sailing in the North Atlantic with full-scale performance measurements are employed as the case study vessels for the comparison.

fuel consumption model

voyage optimization

Great circle route

Energy efficiency


Helong Wang

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Wengang Mao

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Leif Eriksson

Chalmers, Space, Earth and Environment, Microwave and Optical Remote Sensing

Proceeding of 13th International Conference on Marine Navigation and Safety of Sea Transportation

13th International Conference on Marine Navigation and Safety of Sea Transportation
Gdańsk, Poland,

Explore innovative solutions for arctic shipping

The Swedish Foundation for International Cooperation in Research and Higher Education (STINT) (Dnr:CH2016-6673), 2017-05-01 -- 2020-06-30.

EONav - Earth Observation for Maritime Navigation

European Commission (EC) (EC/H2020/687537), 2016-05-01 -- 2019-04-30.

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Transport Systems and Logistics

Other Civil Engineering

Marine Engineering

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1/5/2021 1