50m converted naval ship Plan B relaunched as JeMaSa

5 images

All images courtesy of Gold Coast City Marina & Shipyard

50m converted naval ship Plan B relaunched as JeMaSa

17 June 2025 • Written by Holly Margerrison and Dea Jusufi

The 52-metre HMA Naval Dockyard explorer yacht JeMaSa has been relaunched following a year-long, multi-million-dollar refit program in Australia. 

Works, which were undertaken at Gold Coast City Marina & Shipyard (GCCM), encompassed interior outfitting, full exterior refinishing and engineering works. The "finishing touch" was the installation of a new swim platform, which increased the yacht's LOA from 49.9 to 52 metres.

JeMaSa will operate predominantly in the Pacific as a private and a "one-of-a-kind" charter yacht, with two charters already booked for French Polynesia. Misha Merzliakov was the chosen interior and exterior designer for the refit, while Periscope's Shaun Phelps is responsible for naval architecture.

JeMaSa before and after

JeMaSa was built as an Australian naval ship in 1973 before being transformed into a fully-fledged explorer. The former survey boat has a steel hull and a steel superstructure, a beam of 10 metres, a draught of 3.2 metres and a volume of 746GT.

"The project involved stripping the vessel back to bare metal, followed by a comprehensive redesign to ensure compliance with Class and Flag regulations," explained refit manager Juan Koegelenberg. "[We've] converted JeMaSa to a five-star global cruising motor yacht for the charter market."

As part of her refit, the yacht received new upholstery, wall and ceiling panels, as well as new custom beds and furniture. All guest areas – including the six en suite cabins – benefitted from new marble-top bathrooms. JeMaSa's De Villiers-designed exterior has also been tweaked, with her military-style profile tempered by a bright white superstructure and light grey hull.

On deck, an enclosed "glass house" with sliding doors at bridge deck level was created by the glazing experts at The Boat Works. The windows were also replaced with larger format glazing (courtesy of Integ Marine Windows) for more light and panoramic views.

Andrew Chapman, GCCM’s COO added: "We are very proud to work, once again with Juan. With his specialised companies – X-Plorer Yachts, Liquid Yacht and Marine Scaffolding – Juan has tremendous experience in the transformation of huge vessels here at GCCM."

He added: "Projects like this bring many if not all our in-house talented master craftsmen together and the results are spectacular. This is why owners choose to bring their million-dollar vessels to GCCM."

The exploration yacht, with Pacific Ocean crossing capabilities, is powered by twin Caterpillar diesel engines, delivering a top speed of 12 knots and a maximum range of 7,000 nautical miles.

Formerly Plan B, the yacht was sold in December 2023 at a last known asking price of $14,900,000.

Read More/50m converted naval ship Plan B sold

More about this yacht

HMA Naval Dockyard   49.99 m •  1973

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