The moment a boat stops being a day boat with a berth and starts being somewhere you can live is the moment a door closes behind somebody. Not a curtain, not a filler cushion, not an understanding that everyone will look the other way — a door. The Pursuit OS 405 is where the Offshore line crosses that line, and it does it without giving up the outboards, the fishing cockpit or the ability to run 55 mph.
Forty-three feet on a 13-foot beam, triple Yamaha 450 XTO outboards, 482 gallons of fuel and two separate sleeping areas — the aft one behind a solid-wood privacy door. That combination, at that length, on outboards, is the whole reason this boat exists.
Who It's For
The OS 405 buyer usually has a family or a regular crew of four to six and has stopped pretending that one open cabin works for them. Somebody wants to go to bed early. Somebody else wants to keep talking on the bridge deck. Two sleeping areas and a door solve that, and until you have needed it you will not understand how much it changes a weekend.
The second thing this buyer wants is to stay an owner-operator at 43 feet. Triple outboards, joystick control with Set Point and autopilot, a 4 kW bow thruster with its own joystick at the helm, and a 2-foot-7-inch draft with the motors up mean you can dock it, run it and keep it in water a 43-foot inboard boat could not use. Nothing about the OS 405 requires a captain.
The Performance Sheet
Pursuit publishes a full bulletin for the OS 405 — rpm by rpm, with mph, gallons per hour, miles per gallon and range, tested 8/1/2023 at a full boat test weight of 29,987 pounds with four aboard. Range is stated on 90 percent of the test-condition fuel.
| RPM | MPH | GPH | MPG | Range |
|---|---|---|---|---|
| 3,000 | 19.3 | 30.7 | 0.63 | 273 |
| 3,500 | 28.5 | 38.9 | 0.73 | 317 |
| 4,000 | 36.5 | 53.8 | 0.68 | 294 |
| 4,500 | 42.5 | 69.1 | 0.61 | 266 |
| 5,000 | 48.3 | 87.2 | 0.55 | 240 |
| 5,500 | 54.4 | 103.2 | 0.53 | 228 |
| 6,000 | 55.1 | 110.0 | 0.50 | 217 |
Best cruise is 3,500 rpm: 28.5 mph at 38.9 gallons an hour, 0.73 mpg, 317 miles. Step up to 4,000 rpm and you gain 8 mph for 294 miles, which is the trade most owners will actually make on a long day. Both figures are honest and both are considerably thirstier than the smaller OS 355 — that is what 8,000 extra pounds and a third 450-horsepower engine cost you.
The most useful line on the sheet is the last one, and it is a warning. Between 5,500 and 6,000 rpm the boat gains 0.7 mph and burns another 6.8 gallons an hour. The top end is 55.1 mph, but 54.4 mph is available for a tenth of a mile per gallon less. There is nothing at the top of this range worth having; run it at 5,500 if you are in a hurry and leave the last 500 rpm alone. Acceleration is 0 to 30 mph in 12.6 seconds.
Below Deck: Two Rooms, Not One
The forward cabin is built around an electrically convertible island-style berth — a queen-size memory foam mattress with hinging backrests on a gas-assisted base with storage underneath. Convertible here means it works as a lounge by day and a bed by night without anyone assembling anything, and island-style means you can get out of the port side without climbing over the person in the starboard side. There is a hanging locker, a sofa with storage beneath, a teak table that converts into another berth, and a 32-inch smart TV on a swivel base positioned to be watchable from the portside sofa.
The mid/aft stateroom is the feature that separates this boat from everything below it in the line. Full-size berth, settee, and a privacy door with a solid wood frame that swings outward. Pursuit even lists an aft stateroom privacy door delete as an option, which tells you the door is standard — do not delete it.
The head is a private fiberglass compartment to starboard with a Vacu-Flush porcelain elongated-bowl marine toilet, a 26-gallon holding tank with macerator and stainless deck pump-out, a solid-surface vanity, and a shower with a hot/cold mixing valve and wand behind a linen closet with a shower door. Cabin air conditioning is 16,000 BTU of 240-volt reverse cycle with its own bronze strainer and seacock, fed by a 9 kW Fischer Panda generator with a sound enclosure, service slide and underwater exhaust.
The galley carries a two-burner cooktop and a 1.1 cubic-foot 120-volt microwave, and cold storage is spread through the boat rather than piled in one place: a 75-gallon refrigerated transom box, a 50-gallon port fish box and a 39-gallon box besides.
On the Bridge Deck
Pursuit put Stidd seating at the helm and the companion position — manually adjustable up, down, fore and aft, with folding armrests, and 180 degrees of swivel on the companion seat. Behind a large single-piece windshield, the helm runs dual premium Garmin GPSMAP 9022 displays with a custom Pursuit interface, a GSD25 sounder module and a B175M 1 kW CHIRP transducer.
Two systems are worth calling out because they are standard and they are expensive to add later. The first is a Seakeeper 6 gyroscopic stabilizer with full structural integration and factory-certified installation — Pursuit fits it as standard, which is unusual on an outboard boat and is the single biggest change to how a day at anchor feels. The second is Zipwake trim control with Series S interceptors and fully automatic pitch and roll correction, which does the small trim work you would otherwise be doing with tabs all day.
Cockpit air conditioning is 240-volt reverse cycle, port and starboard 10,000 BTU self-contained units with Stamoid side and drop curtains. Fishing gear includes a hullside door for bringing a fish aboard rather than over the gunwale, and the maximum rating is 1,350 horsepower — exactly what the triple 450 XTOs deliver.
Where It Sits, and Where It Does Not
Against the OS 355 the OS 405 gains 5 feet, a foot of beam, roughly 8,000 pounds, a second sleeping area with a door, a Seakeeper and Stidd seats. It loses efficiency: 0.73 mpg at best cruise against the OS 355's 1.00, and 317 miles of range against 348. If range is your priority rather than accommodation, the smaller boat genuinely wins that argument, and there is no shame in choosing it.
Against the OS 445 the OS 405 gives up the galley-up bridge deck, the second full stateroom, the separate shower stall and 118 gallons of fuel — and it saves you 5,400 pounds, 3 feet 6 inches of length and 16 inches of hardtop clearance, which is the difference between fitting under a bridge or into a building and not.
The Honest Limit
This is a two-sleeping-area boat, not a two-stateroom boat, and the distinction matters. The forward space is a convertible cabin open to the saloon; the aft space is a separate room. One door, one head, one shower, shared by everybody aboard. For a couple plus two kids, or two couples where one pair is happy in the aft room, it works beautifully. For two couples who both want a proper room, the OS 445 is the boat, and no amount of arguing with the floor plan will change that.
The other limit is fuel. Four hundred and eighty-two gallons sounds like a lot until you read 0.73 mpg. Plan around Pursuit's published 317 miles at 28.5 mph, not around the tank size.