Shipping has never bought a promise. It buys what has already survived the sea.

That habit can look slow from the shore. It is really a discipline. A system earns its place on board once its record is open to an independent eye and holds up under one. Evidence moves capital in this industry. Enthusiasm never has.

For the executive signing the order and the tech provider hoping to win it the currency is the same. Proof travels further than any pitch.

Wind propulsion works. Few in shipping dispute that anymore. Yet only somewhere between 50 and 100 vessels out of roughly 50,000 carry it, a fleet penetration of about 0.2%.

That gap is the real story. Emmanuel Schalit of OceanWings reads it correctly. Shipowners are not doubting the physics. They are waiting for evidence that a wing will behave across every trade, every port call and every canal transit without disturbing the cargo operation that pays for the ship. A vessel worth tens of millions is not a test bed.

So the obstacle is proof, and proof takes time at sea. OceanWings points to almost 200,000 nautical miles over three years on its first installation, with reported availability of 99.6%. Figures like these do more for adoption than any efficiency claim, because they speak to what owners actually ask about: reliability, maintenance cost, safety and certification.

The timing sharpens the point. With the IMO's Net Zero Framework delayed, Schalit argues that alternative fuels have lost their commercial footing for years. That is a supplier's view, but the logic is hard to dismiss. An owner still committed to cutting emissions needs savings that do not depend on a price signal that has not arrived. Wind saves fuel whatever the regulation says.

This exposes the industry's deeper weakness, which is measurement. A saving nobody can verify is a saving no charterer will pay for and no financier will lend against. "Our industry cannot exist without this independent verification," Schalit said. DNV's validation of the company's aerodynamic modelling method matters for that reason. It gives owners, charterers and banks a common basis for the number.

Then comes software. A wing trimmed for maximum thrust can work against the rudder, the engine and the propeller. The gain lies in optimising the whole ship, and a third of OceanWings' staff now work on software and AI.

"What we sell to shipowners is payback," Schalit said. The sector should hold onto that sentence. Wind will scale when the return is measured, certified and bankable. The companies that can prove the saving will matter as much as those that build the wing.

The cost of an underused system

How many of the systems you bought last year are being used the way you bought them for?

One IT manager interviewed for The Great Integration described how significant digitalisation budgets are being underutilised because of low adoption. The report looks at why integration starts long before procurement, and ends long after go-live.

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GCMD and BCG find that with only 4% of the fleet renewed each year, today’s fuel and engine choices could shape shipping’s energy mix through 2050.