2020 Boston Whaler 405 Conquest

The 405 Conquest, aka the SUV of the Sea, is envisioned from the keel up as an adventure-ready cruiser, the 405 delivers incredible performance, versatility and ease of use. From the robust bow lounge area, to the ultra-convertible helm companion zone, to the inviting cabin with master and two guest sleeping quarters, the 405 brings sophistication and luxury to the Conquest series. Enjoy long-distance cruises and overnight stays, chase gamefish far offshore, or host an impromptu gathering: With the 405 Conquest, you never have to choose between gracious comfort and exceptional capability.

  • Cabin features private master stateroom and two guest sleeping quarters, an enclosed head with separate shower, a convenient galley and more.
  • Full-beam single-piece windshield with optional side glass for unobstructed visibility and a closer sense of connection with the water.
  • Quad 300-hp Mercury Verado® engines with optional Joystick Piloting provide impressive power and control.
  • Highly customizable transom prep area with multiple fishing and entertaining options.
  • Unique portside companion lounge with hidden table converts to multiple positions.
  • Luxury touches throughout include a rain shower, innerspring mattresses, Corian countertops and premium finishes.
  • Available with Seakeeper gyro-stabilizing system.

Basic Boat Info

Make: Boston Whaler
Model: 405 Conquest
Year: 2020
Category: Power
Construction: Fiberglass


Length: 41'4 ft
Beam: 13'6 ft
Min Draft: 2'7 ft
Bridge Clearance: 12'5 ft
Dry Weight: 22,000 lb
Deadrise: 19 °
Single Berths: 6

Engines / Speed

Engines: 4
Engine #1 Specs:
  • Make: Mercury
  • Model: Verado
  • Engine Power: 300hp
  • Type: Outboard 4 Stroke
Engine #2 Specs:
  • Make: Mercury
  • Model: Verado
  • Engine Power: 300hp
  • Type: Outboard 4 Stroke
Engine #3 Specs:
  • Make: Mercury
  • Model: Verado
  • Engine Power: 300hp
  • Type: Outboard 4 Stroke
Engine #4 Specs:
  • Make: Mercury
  • Model: Verado
  • Engine Power: 300hp
  • Type: Outboard 4 Stroke


Fuel Tanks: 1
Fuel Tank Capacity: 600 gal
Water Tanks: 1
Water Tank Capacity: 90 gal
Holding Tank Count: 1
Holding Tank Capacity: 30 gal


Maximum Number Of Passengers: 20
Heads Count: 1
Boat Class: Walkarounds, Cruisers
More Info : Boston Whaler Website
Standard Equipment
  • All hardware 316-L stainless steel
  • All rails welded 316-L stainless steel
  • Vinylester barrier coat over entire hull and hull sides
Deck / Cockpit
  • 10” stainless steel pull-up cleats – bow (2), spring line (2), crosstie cleats at transom (2)
  • 10” stainless steel cleats – stern cockpit with gunnel boats hawse pipe (2), anchor locker (1)
  • 27” interior freeboard
  • Acrylic transom door with stainless steel latch
  • Anchor windlass with 400’ rode and chain (handheld remote control, stainless steel swivel, polished stainless steel 44lb anchor, polished stainless steel bow roller davit)
  • Boarding ladder at transom
  • Bow eye (heavy duty polished stainless steel)
  • Chrome Boston Whaler logo/model designator
  • Coaming bolsters (cockpit)
  • Dive door (molded fiberglass boarding door on port side with removable stainless-steel dive ladder with dedicated storage in stern seat)
  • Drink holders (stainless steel) (4 in bow, 2 in hawse pipes, 2 at helm, 2 at port console, 2 at port lounge, 2 per side in recessed pockets at aft helm deck seats)
  • Lighting – LED courtesy lights in cockpit (multi-color)
  • Livewell (19-gallon) (pressurized insulated in aft port corner with clear lid, blue interior and dual white LED lights)
  • Rails - hand rails (welded stainless steel) (companion way to helm deck and into cabin, boarding ladders and prep station)
  • Rails – high bow rails (welded stainless steel)
  • Rails – rub rail (white with stainless steel insert) (heavy-duty)
  • Rails – toe rails (cockpit) (stainless steel) (under gunnel storage shelf with downrigger weight holders – 1 per side)
  • Rod holders (gunnel-mounted) (3 aft cockpit starboard) (2 port)
  • Rod holders (under gunnel) (2 starboard)
  • Self-bailing cockpit sole
  • Shower (freshwater with hot and cold water) (near transom door)
  • Shower (freshwater with hot and cold water) (near dive door)
  • Spotlight (ACR RCL-75) (mounted on hardtop)
  • Helm console starboard-side layout includes:
    • A/C unit (16K BTU) with 2 helm vents and wetbar area vent 
    • Bow thruster control
    • Compass (with lighting)
    • Defogger system (port and starboard) (120v heater with blower )
    • Display - 7" color LCD touch screen system monitor and control center
    • Drink holders - extra deep stainless steel (2) 
    • Electronics mounting surface with space for dual 16" or dual 19" Raymarine displays
    • Electrical switch panels with stainless-steel push-button switches and illuminated text 
    • Footrest molded into console with solid teak steps with satin finish 
    • Fusion USB and Aux input 
    • Mercury DTS dual binnacle controls with integrated engine trim controls (single remote ignition key switch in cabin with pushbutton start/stop located at the helm) (Mercury SmartCraft Vessel View 5" color LCD Display) (network connections to Raymarine Navigation Package) 
    • Rails - grab rail (stainless steel)
    • Spotlight control
    • Steering wheel - cast stainless steel with knob and tilt helm
    • Storage recess on top of dash with (1) dual USB and (1) 12-V wireless cell phone charging holder
Open Windshield Hardtop System
  • Canvas (side and aft rigid Makrolon® polycarbonate weather enclosure from door to cockpit) (white Stamoid®) (with storage in aft portion of hardtop)
  • Custom painted integrated aluminum hardtop/windshield frame
  • Deck hatches – with opening integrated into hardtop (2)
  • Handhold along hardtop for egress to foredeck
  • Ladder access to hardtop
  • Lighting – LED blue/white overhead lights; (3) across aft end of hardtop (2) mid over Wet Bar and seating, (1) forward center
  • Lighting – LED blue companionway light (2) at helm deck step and cabin entry steps (turned on via solar sensor)
  • Lighting – LED red/white map overhead light (1)
  • Lighting – LED flood lights at cockpit (2) and bow (1)
  • Lighting – LED navigation lights (stainless steel) (recessed in hardtop)
  • Outrigger ready
  • Rod holders on port and starboard ladder supports (6)
  • Side glass (open tempered)
  • Sunshade (cockpit) (telescoping polished stainless-steel frame retracts and deploys electrically) (black Sunbrella® canvas)
  • Windshield – full height, single piece front tempered glass providing unobstructed visibility, with dual electric actuated vents and independent control
  • Windshield wipers – (2) pantograph, with intermittent wash system
Port Lounge and Console
  • A/C unit (12K BTU) (with 2 vents on dash and seating area vent)
  • Acrylic/glass dash
  • Drink holders – stainless steel (2)
  • Dual helm seat with arm rests that convert to create a large sun lounge area
  • Rail – grab handle
  • Stereo remote control – Fusion Bluetooth remote
  • Storage – glovebox style with (1) dual USB and white LED light
  • Storage recess on top of dash with (1) dual USB and (1) 12v wireless cell phone charging holder
  • Table – teak (high gloss with polished stainless-steel inlay, aft lounge area with electric high low conversion)
  • 110-V outlet
  • 12-V/120-V refrigerator
  • Corian solid surface countertop
  • Galley sink with faucet and cutting board
  • Microwave
  • Skylight over galley
  • Trash receptacle (under c-way step)
  • Wood grain galley cabinetry
  • Bow lounge with dual row tilt up backrests (includes canvas cover)
  • Foldaway stern bench seat with elevated backrest
  • Helm seat (fore and aft electrical adjustment with swivel)
  • Port console seat (2-person, forward facing with innovative mechanism to convert to an aft facing lounge)
  • Port aft facing seat (2-person seat that can convert to a lounge/filler cushion over the lowered table)
  • Port forward facing seat (2-person seat with conversion seatback for aft facing mezzanine seat)
  • Starboard aft facing (2-person mezzanine seat that folds down providing a countertop at the prep station)
  • Bilge - aft mechanical space, large storage tray (deleted with gyro)
  • Cabin galley – upper, mid and lower cabinets at galley
  • Cabin main – cabinets above starboard settee
  • Cabin main – in-floor storage compartment
  • Cabin main – storage under starboard settee
  • Cockpit – downrigger weight holders (2)
  • Cockpit – storage below pullout grill
  • Cockpit – insulated 220qt built-in cooler/storage under seating with dual access
  • Cockpit – rod holders under starboard gunnel (2) (deleted with foldout bench seat option)
  • Fish boxes – insulated in-deck with pump-out (2)
  • Guest mid-berth – large storage compartment under berth with pull out drawers
  • Guest mid-berth – port side cedar lined hanging locker with removable shelves, dish storage and light
  • Guest mid-berth – port side storage under hinged countertop
  • Head – storage cabinet under sink and overhead
  • Helm deck – portside console glovebox and forward storage tray
  • Helm deck – starboard helm storage drawers and forward storage tray
  • Helm deck – starboard wet bar storage drawers and storage compartment
  • Master stateroom forward – large storage compartment under berth
  • Master stateroom forward – port side vertical cabinet with shelves and light
  • Master stateroom forward – starboard side cedar-lined hanging locker with light
Cabin Interior (Main)
  • 120-V receptacle
  • 12-V and dual USB receptacles
  • Air conditioner (16,000 BTU) reverse cycle
  • Carbon monoxide and smoke detectors
  • Cabinets – teak wood, satin finish with maple lining located over settee
  • Digital vessel control – iPad with inductive charging case, monitor vessel systems and control DC circuits
  • Door – cabin entry (lockable acrylic)
  • Lighting – LED white overhead lights with dimmer switches (2)
  • Lighting – LED RGB diffused courtesy lighting with dimmer control
  • Materials – easy to clean interior materials
  • Portholes in hull side windows (4) (opening)
  • Settee – L-shaped with storage under cushions and additional filler cushions with dedicated storage to convert to a sleeping berth
  • Skylight with magnetic stow-away shade
  • Storage – large storage compartment in salon floor
  • Table – dinette (folding with electric high low to convert to a berth) (solid teak wood with gloss finish)
  • Throw pillows (5)
  • Windows – hull side with pull-down pleated shades
Master Stateroom / Forward Berth
  • 120-V receptacle (port and starboard)
  • Air-conditioner (8,000 BTU) reverse cycle with LCD Control
  • Bed – island bed with trunk style front storage access (gas assist hatch), 8” thick Premium Handcraft® pillowtop innerspring mattress with electrically actuated hinged backrest, fitted sheet, comforter and pillowcases (2 regular-size)
  • Cabinets overhead on port and starboard side with flip up doors
  • Carbon monoxide and smoke detectors
  • Door – sliding pocket door separating the stateroom from salon
  • Flooring and entry steps – solid teak with satin finish
  • Lighting – LED RGB diffused courtesy lighting with dimmer control
  • Lighting – LED overhead lights (4)
  • Lighting – LED overhead reading lights (2)
  • Opening hatch
  • Service access to A/C unit (through forward bulkhead) and bow thruster (through the floor)
  • Storage – hanging locker with cedar lining with door activated light (starboard side)
  • Storage – locker with cedar lining with door activated light and shelves (port side)
  • Vacuum – Dyson V7 handheld with charging holder
  • TV – 24” flat screen HDTV with Apple TV Integration
  • Vimar single USB receptacles on port and starboard nightstands
  • Vimar overhead light switch located on starboard nightstand
  • Windows with pull down pleated shades (hull-side)
Enclosed Head Compartment
  • 120-V receptacle at vanity
  • Dual entrance (from cabin and from master stateroom)
  • Flooring – solid surface flooring in the shower and solid teak flooring on the vanity area
  • Lighting – LED overhead light (2) with dimmer
  • Lighting – LED RGB diffused courtesy lighting with dimmer control
  • Mirror – full length (located on acrylic stateroom access door)
  • Opening port light
  • Rails – handrail (stainless steel)
  • Shower – enclosed shower with rain head and hand-held sprayer with hot and cold faucet and bi-fold acrylic shower divider
  • Shower sump
  • Skylight (frosted glass)
  • Toilet paper holder inside vanity
  • Towel ring and bar
  • Trash chute in counter
  • Vacu-Flush® toilet (electric), holding tank with vent filter, overboard discharge, dockside pump-out, tank full indicator alert and progressive tank level indication integrated into digital network
  • Vanity storage
  • Vanity with ceramic vessel sink and polished chrome faucet
  • Ventilation (forced air)

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