of arrival, and offering advice on the best route achieving the lowest possible fuel consumption or, by the same token, the route that achieves the safest passage or, at the detailed level, avoids the potential for parametric roll. Alternatively, or at the same time,
ocean current information could be factored in to colour the ship master’s judgment in selecting the optimum route. Typically, a ship’s master will run
the ship at high speed until the ship hits bad weather, and then throttle back. This has consequences for fuel consumption, ship damage and cargo losses. With weather predictions available to the master twice daily, VVOS offers an alternative scenario that might persuade the master to run at slow speed during calm weather,
waiting out the storms ahead, and then speed up once the bad weather has passed. Mr King said that Jeppesen ran a 24
hour a day weather prediction centre in San Jose by way of back-up, which masters could call into at any time, should they require additional updates. At the same time, via a quarterly key
performance report, the fleet manager can track the performance of the ship in terms of its fuel consumption, its coatings performance, propeller fouling or hull stress. Mr King said the Jeppesen VVOS offered users a common visual reference that could be looked at by all parties in order to avoid confusion. VVOS has even been used as an expert
witness tool to support cases where owners have contested the quality of coatings work carried out by a yard.
Mr King said a 5000TEU+ capacity
containership operating on the Pacific had demonstrated 6% fuel savings over a sample period by using VVOS. He said that the number of hours when heavy weather delayed operations had decreased by 80, while the number of damage claims due to heavy weather had decreased by 73% and the cargo damage claims due to heavy weather had been cut by 87%. Transpacific fuel savings of 5% to 11% were achieved over the comparable ‘sprint and loiter’ approach to seafaring. He said that, on average, users of
VVOS had achieved 4% fuel savings, and that the return on investment for the subscription-based service was palpable. Any user that could demonstrate that this was not so could have their money back, he said. NA
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In-depth
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