2021 Boston Whaler 405 Conquest
MarineMax Baltimore
1800 S. Clinton St. Baltimore, Maryland 21224
(443) 552-7670
2021 Boston Whaler 405 Conquest

2021 Boston Whaler 405 Conquest

Stock # 165178
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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.

This 2021 model information is offered in advance of finalized details; your authorized Whaler dealer can provide the boat's most current specifications.

  • Specifications

    Boston Whaler
    405 Conquest
    Model Year
    Hull Material
    Hull Design
    Modified Vee
    Sports Fishing Boats
  • Description

    Length Overall
    40 feet
    13.5 feet
    Maximum Speed
    0 miles per hour
    Cruising Speed
    miles per hour
  • Engine

    WHT JPO 400 L6 VDO
    Number of Engines
    Horse Power
    1600.0 hp
    Fuel Type

Exterior Color


Standard Equipment

  • All hardware 316-L stainless steel
  • All rails welded 316-L stainless steel
  • Vinylester barrier coat over entire hull and hull sides

Interior Color


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


The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

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)

Included Options

  • Chrome Graphics w/silver stripe
  • Steel Blue
  • Black Canvas
  • White underside H/T
  • Joystick Q-400 L6 VDO - White
  • Anchor Windlass Chain
  • AFT COCKPIT TABLE (2 - Solid Teak with ded
  • COCKPIT REFRIGERATOR (DR 65) (At helm deck w
  • UNDERWATER LIGHTING (Blue LED (6) - (4) tran
  • GENERATOR DIESEL (120V) (15kW) (Required for
  • FREEZER - TOP LOADING (built into starboard
  • HARDTOP WITH SUNROOF (Electric) (Deletes dua
  • FULL SIDE GLASS (Full height side glass with
  • facing aft with JL Audio amplification) (
  • in main salon infotainment sound system) (
  • audio experience with stateroom infotainme
  • SATELLITE RADIO (Sirius satellite receiver w
  • subscription) (M324-S Thermal camera wit
  • ENGINE FLUSH SYSTEM (with remote activation
  • ROD STORAGE (mid berth rack system for (6) 6


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