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THIS Is What is a beautifully maintained 1999 Mainship 430 Aft Cabin Trawler, offering a rare combination of comfort, performance, and practicality. This 3-stateroom, 2-head layout is ideal for extended cruising or liveaboard life, with a spacious interior that includes a master stateroom featuring an island queen berth for ultimate comfort.
Powered by twin Caterpillar 350 HP engines, she also features a Kohler 8 kW generator, oil change system, dripless shaft seals, and a Weaver tender davit system—ensuring convenience and ease of maintenance. The flybridge is expansive, protected by a bimini and isinglass enclosure, and perfect for entertaining or navigating in comfort.
Additional highlights include an AB aluminum RIB tender with a 9.9 HP Yamaha outboard and an upgraded Garmin electronics suite. A veteran of the Great Loop, THIS Is What is a proven performer—well-equipped, reliable, and ready for her next adventure.
Recent upgrades and maintenance includes:
2025
Upper helm Isinglass replaced
Salon bottom cushions reupholstered
Salon, galley and lower helm hardwood floor refinished
2024
New 4 blade propellers 24x18
Upgraded Vacuflush generator
New Forward MarinAire 9,000 BTU air conditioner
Upper helm cushions reupholstered
2023
Garmin AIS800 installed
VHF radio installed
New Vitrifrigo refrigerator
2022
150' G4 5/16" anchor chain
Garmin GPSMAP multi-purpose display installed
Garmin Fantom 1 radar installed
Pepwave internet router with WiFi installed
2021
Garmin ECHOMAP plotter
Engine Fire Suppression system
Mast Hinged
2019
AB Hypalon Aluminum RIB tender
Yamaha 9.9 HP outboard
Delta Anchor 44 lbs
Specifications
Boarding THIS Is What from the swim platform, you enter through the transom door into the cockpit. From here, you can either proceed forward along the wide side decks or step directly down into the master stateroom via its private access door. Both side decks lead to molded-in steps that take you up to the aft deck, with convenient access to port and starboard side walkways and the foredeck.
From the aft deck, additional molded steps lead up to the spacious flybridge or into the salon through the sliding aft door.
Inside the salon, you'll find a comfortable and well-designed living space. To port is a large U-shaped settee surrounding a hardwood dinette table, while the port forward section houses the fully equipped, dual-sided galley. To starboard forward is the lower helm station, just aft of which sits a full-size refrigerator and flat-screen TV. Starboard aft features a built-in desk with two folding teak chairs and cushions, providing a versatile work or relaxation space.
Moving forward and down a few steps, you'll find the guest head with a separate enclosed shower to starboard and the midship guest stateroom to port. The forward guest stateroom is located in the bow, while the master stateroom—complete with an ensuite head—is located aft and can be accessed from either the salon or the cockpit.
The engine room is easily accessed through a hatch in the salon sole or via the lift-up steps leading to the forward berthing area.
THIS Is What offers a spacious, full-beam master stateroom aft, featuring a queen-size island berth and a private ensuite head with a separate enclosed shower for added comfort and convenience.
Forward, the guest stateroom in the bow includes a V-berth with a filler cushion to create a double berth. Just aft and to port is the midship guest stateroom, which offers two single berths—perfect for additional guests or crew.
The guest head is located to starboard, just aft of the forward stateroom, and also features a separate enclosed shower.
The salon aboard THIS Is What offers a warm, inviting, and highly functional layout. To port, a large U-shaped settee provides comfortable seating with ample storage beneath the cushions. On the starboard side, a built-in desk occupies the aft corner, accompanied by two folding teak chairs with cushions. A flat-screen TV is mounted on the aft side of the refrigerator cabinet, perfectly positioned for easy viewing.
Forward on the starboard side, you’ll find the large refrigerator and the lower helm station—both thoughtfully integrated for convenience and functionality.
From the salon, you have direct access to the master stateroom, aft deck, galley, engine room companionway, midship guest stateroom, guest head, and the forward guest stateroom—making this central space a true hub of the vessel.
Large opening side windows and a forward windshield flood the space with natural light and provide excellent ventilation. The teak and holly sole, complemented by rich hardwood trim, adds a classic nautical elegance to this beautifully designed interior.
The fully equipped, dual-sided galley is located forward in the main cabin to port, offering excellent functionality and storage for extended cruising. Sliding doors on both the port and starboard sides provide convenient access to the wide side decks, making provisioning, docking, and deck access easy and efficient.
The galley features:
Dining options include the elegant hardwood table at the U-shaped settee in the salon, as well as an additional table on the flybridge—perfect for alfresco meals with a view.
The full-beam master stateroom, located aft, offers a spacious and thoughtfully designed retreat. A walk-around queen-size berth is positioned to port, flanked by nightstands and reading lights for added comfort. The stateroom features a carpeted sole, a cedar-lined hanging locker, generous drawer and cabinet storage, as well as additional space beneath the berth.
Natural light fills the space through six curtained portlights, creating a bright and inviting atmosphere. For added convenience, stairs and a hatch provide direct access to the cockpit.
The private ensuite head includes a vanity, toilet, and a separate enclosed shower—delivering both comfort and privacy for extended stays aboard.
The forward guest stateroom, located in the bow, features a versatile V-berth with a filler cushion to create a comfortable double berth. Four portlights and an overhead hatch with a screen provide abundant natural light and ventilation. The space is thoughtfully appointed with a carpeted sole, built-in shelving, two cedar-lined hanging lockers, and ample drawer storage—offering both comfort and functionality for extended stays.
The midship guest stateroom, located just forward of the galley, features side-by-side single berths with a shared nightstand and reading lights—perfect for accommodating guests or crew. Additional storage is available beneath the berths, complemented by a hanging locker and a small cabinet for personal belongings. A portlight and overhead hatch with a shade provide natural light and ventilation, while the carpeted sole adds a touch of comfort and warmth to the space.
The guest head is located to starboard, just forward of the lower helm and adjacent to the midship guest stateroom. It is well-appointed with a vanity, toilet, and a separate enclosed shower—providing both privacy and practicality for guests.
The lower helm, located forward on the starboard side of the salon, is ideally positioned for short-term navigation tasks such as docking or locking. It also features a convenient side deck access door, allowing for quick and easy entry or exit. The lower helm features:
The flybridge is thoughtfully designed for both comfort and functionality. It features a canvas bimini with Isinglass panels, offering protection from the elements. To starboard, a large bench seat with storage provides ample seating, while an L-shaped bench seat to port and aft includes additional storage and a convenient table. At the center and forward, the captain's helm seat is flanked by two co-captain chairs, ensuring a comfortable and functional helm station.
The flybridge helm features:
The aft deck is securely enclosed by stainless steel rails and features a variety of practical amenities, including an outboard motor davit, an outboard motor storage mount, a large dock box for gear, fender storage, and space for the auxiliary anchor. Molded-in steps forward provide easy access to the flybridge, while port and starboard molded steps offer convenient access to the side decks.
The cockpit is well-equipped for both convenience and functionality, featuring a transom gate that leads to the swim platform. It includes a hatch for access to the master stateroom, as well as a lazarette access hatch for additional storage. A hot/cold freshwater shower is available for rinsing off after a swim, while aft power connections offer easy hookups. The non-skid deck ensures safety while moving around the space.
This yacht features the following audio and video equipment:
This yacht features the following engine and mechanical equipment:
This yacht features the following electrical equipment:
This yacht features the following tender and equipment:
This yacht features the following deck equipment:
This yacht features the following safety and fire equipment:
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