Definition
A catamaran tender is a twin-hulled tender chosen for its stability at rest, its shallow draft, and the deck volume its hull-separation geometry allows. It carries more guests across a flatter, drier deck than a monohull of equivalent length, and behaves predictably when boarding at anchor.
Background and use
Catamarans suit two specific tender duties well. The first is guest transport in calm to moderate water, where the wide deck and lack of heel make boarding from a swim platform or pontoon trivial. The second is beach and dive work, where shallow draft (often under 0.5m) gets the boat closer to shore than any monohull can manage. Onda, Coral Catamarans, and Aquila have built reputations in this niche. Custom builds from yards such as Sunreef and Silent Yachts also produce catamaran tenders for the larger expedition fleet.
The penalty is offshore behaviour. Twin hulls slam in a beam sea more than a deep-V monohull, and the cross-deck structure transmits noise. Catamaran tenders rarely run beyond 25-30 knots without dedicated foiling assistance, and most owners spec them as the calm-water guest boat alongside a deep-V chase boat or limousine for rougher conditions.
Garage fit is the practical limiter. Catamaran tenders need beam, often 3.5-4.5m on a 9m boat, and most yacht garages are dimensioned for narrower monohulls. Owners specifying a catamaran tender during the new-build phase can have the garage sized accordingly; retrofitting one to an existing yacht is rarely viable. Aft-platform stowage with custom chocks is the alternative.
Related considerations
- Confirm garage beam carefully; the wide hull-separation geometry is the most common deal-breaker.
- Catamaran tenders ride better at displacement speeds than at planing speeds; spec the engine package accordingly.
- Boarding ease at anchor is the headline feature; verify with elderly or mobility-limited guests in mind if relevant.
- Deck drainage on twin-hull tenders needs scuppers in both hulls; check spec for self-bailing capability.
- Outboard propulsion is typical; sterndrive and surface-drive options exist on larger custom builds.