Williams vs Navisoul: premium jet tender or complete RIB

Published on 21 July 2026

The British jet tenders versus Caral Marine's RIBs: when each makes sense, with real prices across the Williams range and its Navisoul equivalent.

Before comparing: the garage question

Williams competes with no one on its home turf: if your yacht has a stern garage and the tender must fit inside, jet propulsion (no propeller, less draft, less overall length) is the answer and Williams is its benchmark. In that case no RIB — ours included — enters the conversation.

The comparison matters for everyone else: those looking at a Williams without needing the garage, drawn by the brand. There, the same money buys two different worlds — and we’ve measured it range by range with real prices.

Minijet and Turbojet: the entry point (€18-52k)

• 👉 Minijet 280 vs Navisoul 480 — ~€18.5-25k of 3-seat jet versus ~€23-25k of 4.8 m RIB with 60 hp.

• 👉 Turbojet 285 vs Navisoul 550 — from ~€49k versus ~€39k for the 550 with 115 hp.

• 👉 Turbojet 325 vs Navisoul 550 — from ~€52k: the gap grows with the jet’s size.

• 👉 Turbojet 445 (discontinued) vs Navisoul 550 — out of production: you’ll only find it second-hand, where a new 550 with warranty for similar money changes the conversation.

Sportjet: the sporty one (€37-112k)

• 👉 Sportjet 435 vs Navisoul 600 — ~€37-40k of jet versus a 6-metre, 150 hp RIB for similar money.
• 👉 Sportjet 395 vs Navisoul 600 — from ~£96,000 (≈€112k): the biggest value gap we’ve measured — one Sportjet buys nearly three Navisoul 600s.

Dieseljet: the superyacht fleet tender (€90k+)

Here Williams answers a real operational requirement: diesel fuel shared with the mothership. If your operation demands it, it’s one of the few serious answers on the market.

• 👉 Dieseljet 445 vs Navisoul 750 — from ~€90k versus 7.6 m and 13 seats for a fraction.
• 👉 Dieseljet 565 vs Navisoul 930 — the diesel flagship versus our twin-engine flagship.

The summary table

The honest verdict

• Garage tender or diesel fleet requirement → Williams, no debate. It’s its niche and it rules it alongside Castoldi.
• Any other case → the same budget at Navisoul systematically buys twice the boat: more length, more seats, real range and universal outboard maintenance.
• Torn between a Williams and “more boat”? Tell us the model and your use: we’ll send the comparison with both prices within 24 h.

Indicative prices from public listings (2025-26). See also: Williams analysis, the yacht tender guide and all comparisons.