What makes a marina superyacht-capable?

Length gets quoted, but it is rarely the binding constraint. A marina is genuinely superyacht-capable when the whole chain works for a vessel over roughly 24 metres.

Depth at the berth and through the approach, at the worst state of tide. A 40-metre berth is useless at 3 metres of water to a vessel drawing 4.

Unrestricted beam and turning room, including the fairway a vessel has to swing in.

Power at the right specification — three-phase, and often high-amperage or 50Hz shore power that smaller marinas simply do not carry.

Bunkering at volume. High-flow or ultra-high-flow diesel, because filling a superyacht through a recreational pump is measured in hours.

Refit capability within reach. Either a large travel lift on site or a shipyard close enough to be practical, plus the trades to crew a refit.

Crew and provisioning support — somewhere for crew to live, customs and border clearance if the vessel is arriving internationally, and provisioning that can handle the volume.

In Australia this narrows quickly to a handful of locations, concentrated on the Gold Coast, Brisbane River, Sydney Harbour and Far North Queensland.