Yacht Attessa 4: Ownership, Specs, and How to Track It

Attessa IV is a privately owned superyacht, not listed for public charter or sale on any major yacht database. To verify her current position, query IMO 9179830 or MMSI 319630000 on MarineTraffic or VesselFinder. For ownership confirmation, check Equasis or the Cayman Islands flag registry. If you want to inquire about a similar refitted superyacht, contact a specialist broker directly.

Quick reference: IMO 9179830 | MMSI 319630000 | Flag: Cayman Islands | Status: Privately owned, not publicly listed for charter or sale.

• Verify position now: MarineTraffic or VesselFinder, search by IMO 9179830
• Confirm ownership: Equasis (equasis.org), then Cayman Islands Shipping Registry
• Inquire about similar vessels: Contact Exoticacharters or a licensed superyacht broker

Table of Contents

• Attessa IV: core specs, designers, and what she was built to do
• How the 2011 refit transformed the vessel and earned industry recognition
• Performance and interior highlights that set Attessa IV apart from her peers
• What ownership records show and where public disclosure ends
• How to find Attessa IV's current location using AIS trackers
• Is Attessa IV for sale or available to charter?
• How to verify vessel details before you commit to anything
• Key Takeaways
• Why refitted classics like Attessa IV deserve more serious attention
• Attessa IV is unavailable — here is how Exoticacharters can help
• Authoritative sources and next steps for verifying Attessa IV

Attessa IV: core specs, designers, and what she was built to do

Built in 1999 by Evergreen Shipyard (Hayashikane) in Nagasaki, Japan, Attessa IV was originally launched under the name Evergreen. Naval architect Diana Yacht Design shaped the hull; Felix Buytendijk handled both exterior and interior design. The vessel was conceived from the outset as a large-group hospitality platform, with resort-scale entertainment spaces and crew accommodations that exceed what most yachts of her era offered.

Stat to know: At ~101.2 m (332–333 ft) in length, with a beam of ~16.75 m, draft of ~4.6 m, and gross tonnage of ~2,864 GT, Attessa IV sits firmly in the megayacht tier — a vessel whose scale shapes every operational decision from port fees to provisioning.

Key snapshot:

• Naval architect: — Diana Yacht Design

How the 2011 refit transformed the vessel and earned industry recognition

The most consequential chapter in Attessa IV's history is the heavy refit completed in 2010–2011, led by Washington Yachting Group. This was not a cosmetic refresh. The hull was lengthened by nearly 10 meters, a new superstructure was added, an additional top deck was constructed, and the helipad and tender garage were reconfigured. Changes of that structural magnitude require full class-society re-certification, which means Lloyd's or ABS survey reports from that period should exist and are worth requesting through any broker.

The result earned Attessa IV the Best Rebuilt Yacht award at the World Superyacht Awards in 2011, the industry's most respected recognition for refit quality. For buyers and brokers, that award carries real weight: it signals that the structural and systems work met independent scrutiny, not just the owner's satisfaction.

Why this matters for valuation: A World Superyacht Award win for a rebuild is a documented quality signal. It does not replace a current survey, but it establishes a baseline of credibility for the refit work that most heavily modified hulls cannot claim.

• Lengthened significantly during the 2010–2011 refit
• New superstructure, top deck, and reconfigured helipad/tender garage
• Refit led by Washington Yachting Group
• Won Best Rebuilt Yacht, World Superyacht Awards, 2011
• Full class re-certification required and completed

Pro Tip: When evaluating any heavily refitted classic hull, request the classification society survey reports from both before and after the refit. For Attessa IV, search under the original name "Evergreen" as well as "Attessa IV" — registry and builder records are often indexed under the vessel's earlier name.

Performance and interior highlights that set Attessa IV apart from her peers

Attessa IV is powered by twin Wärtsilä 12V32E diesel engines, delivering a top speed typically reported in the low twenties of knots and a cruising speed often cited in the mid-teens knot range. For a displacement vessel of her size and era, those figures are notably strong; trade coverage consistently positions her as a performance benchmark among late-1990s large-displacement motor yachts. Her fuel capacity supports a published long-range capability, making extended ocean passages practical rather than exceptional.

On the interior, the hospitality design is genuinely distinctive: up to 18 guests in nine suites, a full-size karaoke bar, and a dedicated dance floor. Those last two features are unusual at any scale and have real operational consequences — they affect service staffing, provisioning loads, and event insurance requirements for any charter arrangement.

Pro Tip: Different databases — including SuperYachtTimes and Superyachts.com — report varying GT and beam figures for Attessa IV. Always request the official Equasis record and the most recent class survey before relying on any directory listing for a transaction.

What ownership records show and where public disclosure ends

Attessa IV is registered under the Cayman Islands flag, one of the world's most common registries for large private yachts precisely because it offers a degree of ownership privacy. The IMO number (9179830) is a permanent vessel identifier that stays with the ship regardless of name changes or re-registrations; the MMSI (319630000) is the radio identity used by AIS transponders.

The practical limit: Public registry searches will confirm the vessel's flag state, class, and technical details. Beneficial ownership — the actual individual or family behind the vessel — is almost always held through a corporate structure, and that layer is not publicly disclosed in most flag registries, including Cayman Islands.

Steps to confirm what is publicly available:

1. Search Equasis (equasis.org) by IMO 9179830 for flag, class, and inspection history.
2. Query the Cayman Islands Shipping Registry for the registered owner entity name.
3. Cross-reference the corporate entity name in commercial databases (e.g., OpenCorporates) to trace beneficial ownership where disclosed.
4. Contact a licensed superyacht broker for confidential owner-contact channels — this is the standard route for serious buyers.
5. Request a registry extract through your broker; it will confirm the current registered owner and any mortgages or encumbrances.

How to find Attessa IV's current location using AIS trackers

MarineTraffic and VesselFinder are the two primary AIS platforms for tracking Attessa IV. Both publish reported positions, navigational status, speed over ground, and recent port calls. A free account gives you basic position data; paid tiers add historical tracks, satellite AIS coverage, and faster update intervals.

Step-by-step tracking approach:

1. Go to MarineTraffic or VesselFinder.
2. Search by IMO 9179830 or MMSI 319630000 — using the identifier is more reliable than searching by name.
3. Check the timestamp on the last reported position. A position older than 24–48 hours may indicate the transponder is off or the vessel is in a low-coverage area.
4. Review recent port calls for a pattern of movement.
5. Note the reported draught — a loaded draught suggests the vessel is in active use.

Limitations to keep in mind:

• AIS transponders can be switched off legally in international waters, creating intentional gaps.
• Satellite AIS coverage has update delays of several hours in remote ocean areas.
• Coastal AIS (terrestrial receivers) only picks up signals within roughly 40–50 nautical miles of shore.
• If position data is stale or absent, contact a superyacht broker or the relevant port authority for the last known port of call.

Is Attessa IV for sale or available to charter?

Major yacht databases list Attessa IV as privately owned and not available for public charter or sale. That status can change without public announcement — private sales and discreet charter arrangements at this level rarely appear on open listing platforms.

If you want to buy:

• Retain a licensed superyacht broker with megayacht transaction experience.
• Ask the broker to make a confidential owner inquiry through established channels.
• Commission a full technical survey (hull, machinery, electrical) and a class survey review before any offer.
• Prepare proof-of-funds documentation early; private sellers at this scale expect it before substantive discussions begin.
• Budget 12–24 months for a transaction of this complexity, including survey, flag transfer, and crew transition.

If you want to charter a similar vessel:

• Contact a specialist broker such as Exoticacharters, who can source comparable refitted classics with large-group hospitality layouts.
• Specify your guest count, preferred region, and any entertainment requirements — vessels with karaoke bars and dance floors require specific provisioning and staffing plans.
• Expect charter rates for a vessel of this scale and specification to reflect both the size and the post-refit systems quality.
• Allow 4–8 weeks for itinerary planning and crew briefing on a first charter of this complexity.

How to verify vessel details before you commit to anything

Different industry directories report conflicting figures for Attessa IV — GT, beam, and guest counts vary across sources. That is normal for a vessel with a major refit history, but it means you should never rely on a single database for a transaction.

Quick red flags to watch for:

• GT or displacement figures that differ significantly across Equasis, the flag registry, and broker listings
• A major refit on record with no corresponding class survey documentation
• Ownership chain gaps in registry records between name changes (Evergreen to Attessa IV)
• AIS position history that shows no port calls for extended periods without explanation

Key Takeaways

Attessa IV is a privately owned, non-listed superyacht whose 2011 heavy refit and World Superyacht Award win make her a documented benchmark for rebuilt megayachts — verify her status via IMO 9179830 on Equasis and AIS trackers before drawing any conclusions from directory listings alone.

Why refitted classics like Attessa IV deserve more serious attention

There is a tendency in the superyacht world to treat age as a liability. Attessa IV argues the opposite case rather persuasively. A hull built to the structural standards of a 1999 Hayashikane build, then lengthened and re-certified through a full class process, carries a kind of documented integrity that a newer vessel with a shorter survey history simply cannot match. The 2011 World Superyacht Award is not a marketing badge; it reflects independent industry scrutiny of the actual work.

What we find genuinely compelling at Exoticacharters, having worked with former captains and water-sports professionals across vessels of this scale, is how the hospitality architecture of a vessel like Attessa IV translates into real charter experiences. A dedicated dance floor and karaoke bar are not frivolous details; they define the kind of evening a group of 18 guests can have at anchor in a remote bay, far from any marina. That is the difference between a yacht that sleeps guests and one that genuinely hosts them.

The verification-first approach we recommend throughout this profile applies equally to any refitted classic you are considering. Request the class surveys, trace the ownership chain, and check the AIS history for operational patterns. A vessel that has been actively used and properly maintained tells a story in its port call record that no brochure can replicate.

Attessa IV is unavailable — here is how Exoticacharters can help

For large groups seeking the kind of dramatic, resort-scale experience that a vessel like Attessa IV delivers, Exoticacharters offers access to comparable refitted superyachts and fully crewed luxury yachts across some of the world's most extraordinary destinations, including options like a weekly private cruise with Off the Hook Cruises for an exclusive boat tour experience in Halkidiki.

Our team of former captains and water-sports professionals can source similar large-group options, build bespoke itineraries, and handle the broker inquiry process for private or semi-private vessels. One strong starting point from our own fleet is the 4A | 129' Sanlorenzo, a beautifully appointed motor yacht suited to groups who want polished hospitality without the operational complexity of a 100-meter vessel. For readers specifically looking at large-group charters for 12–20 guests, our curated listings cover vessels with the space, crew, and entertainment capacity to match that ambition. Browse the full luxury yacht collection or speak directly with a charter specialist to discuss your dates, destination, and group size.

Authoritative sources and next steps for verifying Attessa IV

Use these primary sources in the order listed for the most reliable verification path:

• Equasis — free vessel safety and ownership record search by IMO number; start here
• MarineTraffic — Attessa IV AIS entry — live and historical position data
• VesselFinder — IMO 9179830 — alternative AIS tracker with port call history
• Boat International — Attessa IV directory entry — refit history and award documentation
• YachtBuyer — Attessa IV profile — canonical dimensions and availability status
• Diana Yacht Design — Attessa IV project page — design credits and hospitality layout details
• SuperYachtTimes — Attessa IV overview — cross-reference for GT and spec discrepancies
• Exoticacharters luxury yachts — for charter inquiries on comparable refitted superyachts

For documents (registry extracts, refit survey reports, builder certificates), the recommended route is through a licensed superyacht broker who can request them through confidential owner channels. Searching historical records under the vessel's original name, Evergreen, will surface additional builder and classification records that post-refit entries may not index.

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