18 Defiant

About the 18 Defiant

About the 18 Defiant

The Maritime 18 Defiant is one of the latest additions to Maritime Marine’s line of 14-to 25-foot powerboats.

The standard for Maritime’s dry riding, stable, seaworthy, fuel-efficient hulls, the 18 Defiant now has available all the features wanted by the avid fisherman with the comforts necessary for family fun.

Starting with the 1890 hull, the company’s most popular model since its introduction in 1992, the design team improved this “big” 18-footer with its well-proportioned center console and comfortable leaning post by adding a stylish wraparound deck and moving the fuel tank below the floor to provide increased storage space. These changes and others now allow the easy addition of Maritime’s 32-gallon Kodiak livewell/baitwell and raw water washdown systems. A long list of rail, cushion, canvas, and fishing options are also available to further customize your Maritime to meet your individual needs.

Easily Plane with Modest Horsepower

Typical of Maritime’s entire product line, the 18 Defiant planes easily with modest horsepower. Though the boat can be powered with 115HP to achieve top speeds in the 42-45 mph range, more typical would be a 90HP or even a 70HP engine where the boat still planes cleanly at just 12-14 mph. The reputation for fuel efficiency is maintained with average economy of over 6.5 mpg and less than 4.0 gph at average cruising speeds of 24-26 mph. Importantly, this superior performance, made possible by the hull’s 35º bow deadrise, the wide chines, perfectly positioned lifting strakes, and relatively shallow 10º aft deadrise, also comes with an ability to comfortably take on choppy seas and rough weather while still sneaking through shallow water due to the boat’s minimal 9″ draft.

Rugged 100% Composite Fiberglass Boat Construction

The 18 Defiant continues the Maritime tradition of rugged durability and ease of maintenance. Starting with premium raw materials, the solid fiberglass hulls are reinforced with a molded fiberglass grid system bonded to the hull for strength and rigidity which is then fully foamed for flotation and “unsinkability”. Combine these features with a solid composite cored transom, which has never experienced a failure since the first Maritime was built, and you start to appreciate the strength, safety, and reliability of these boats.

All told, there is nothing like a Maine Built Boat. That’s a Maritime!

Features & Specs

Standard Features

  • 32″ Console w/ Front Seat (includes rail & windshield)
  • 34″ Leaning Post Assembly (includes cushion & rail)
  • Full Wrap-Around Non-Skid Deck w/ Heavy-Duty Rub Rail
  • 44″ Bow Platform w/ Lockable HatchNFB Steering w/ Stainless Steel Wheel
  • (4) 8″ Stainless Steel Cleats
  • Bow Bitt and 6″ Chock (stainless steel)
  • Navigation Lights w/ 6-Switch Panel
  • 12-Volt Power Supply
  • (2) Drink Holders
  • Flush Mount Horn w/ Stainless Steel Grill
  • Auto/Manual Bilge Pump
  • Under Gunwale Rod Storage
  • Single Battery Wiring Package
  • 29 Gallon Fuel Tank w/ WEMA Sender
  • Self-Bailing Cockpit
  • Foam Flotation to Meet or Exceed Safety Standards
  • 10 Year Limited Transferable Hull Warranty



  • Length: 18’6″
  • Beam at Gunwale: 7′ 6″
  • Beam at Waterline: 6′ 4″
  • Draft: 9″
  • Cockpit Depth (average): 18″
  • Transom Height: 20″
  • Fuel Capacity: 29 gallons
  • Hull Weight with Standard Equipment: 1600 lbs
  • Max Capacity: 7 persons or 1000 lbs
  • 1650 lbs (persons, motor, gear)


  • Minimum Horsepower: 60
  • Maximum Horsepower: 115
  • Average Horsepower: 90
  • Top Speed with Maximum Horsepower:
    40 – 45 MPH
  • Hull Plane Speed: 12 MPH
  • Cruise Speed: 20-26 MPH
  • Range at Cruise Speed: 150-165 Miles
  • Fuel Efficiency at Cruise Speed: *
  • Greater than: 6.5 MPG
  • Less than: 4.0 GPH

*Varies based on engine model and horsepower.


A big 18 footer packed with features and performance the 18 Defiant achieves 6.5 MPH and consumes less than 4.0 GPH with mid-sized outboards.


18 Defiant Evinrude Performance Data

Click on the link below to learn more about the 18 Defiant’s impressive fuel efficient performance.



Contact Us

Ocean House Marina Directions
PO Box 1399 – 60 Town Dock Rd.
Charlestown RI 02813
Phone: 401-364-6040
Email : Click here to contact us

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