Grady White 300 Marlin — Quick-Reference Specs
- Boat Model: Grady White 300 Marlin
- Cover Type: T-Top Boat Cover
- Status: Discontinued (2001–2010)
- Length Overall (LOA): 30'0"
- Beam: 10'3"
- Dry Weight: ~7,200 lbs
- Engine: Twin outboards, max 700 HP (twin Yamaha 300s or 350s)
- Fuel Capacity: 300 gallons
- Deadrise: 20°
- Draft: 22"
- Hull Type: SeaV² walkaround
Cover Features
- Fabric Options: 9oz solution-dyed marine fabric or premium Sunbrella acrylic
- Coverage Type: T-Top cover wraps hull below hardtop; hardtop remains exposed
- Construction: Reinforced stitching, hem cord at rubrail, adjustable tie-down straps
- Durability: Solution-dyed fabric (5–7 years); Sunbrella acrylic (8–10 years)
- Fit: Custom-fitted to 30'0" Marlin walkaround with twin-engine configuration
- Protection: UV-resistant, water-repellent, weatherproof
Additional information
Choose Your Cover Fabric
7 oz. Polyester — Our entry-level marine cover fabric, woven from 100% polyester fiber at a 7 oz. per linear yard weight. This lighter option keeps the cover manageable for solo handling while still delivering reliable protection against sun, rain, and debris. Backed by a 3-year fabric warranty. Ships in Black.
9 oz. Polyester — Step up to our heavy-duty polyester, engineered at 9 oz. per linear yard for boats that face tougher conditions or extended outdoor storage. The denser weave adds an extra layer of defense against abrasion and weather without adding unnecessary bulk. Protected by a 5-year fabric warranty. Ships in Navy or Black.
Sunbrella® — For boaters who want the best, our Sunbrella covers use 100% solution-dyed acrylic — the same fabric trusted by marine professionals worldwide. Naturally resistant to fading, mold, and water damage, Sunbrella holds its color and integrity season after season. Covered by a 6-year fabric warranty. Ships in Black, Smoke, or Marine Blue.
Both polyester options feature solution-dyed construction, where pigment is infused into each fiber during production rather than applied to the surface afterward. This process locks color deep into the material, preventing any dye transfer to your boat’s gel coat or finish. The result is a cover that stays vibrant without bleeding or rubbing off. Our polyester is also designed to breathe — it allows moisture trapped underneath to vent out naturally, reducing the risk of mildew and keeping your boat dry. The fabric holds its form without sagging or stretching over time, stays lightweight enough for one person to handle, and stands up to prolonged UV exposure and harsh marine weather.
*The warranty periods above are provided by the fabric manufacturer and cover the material itself. For details on what’s included in the warranty for your completed cover, please see our warranty page.
7 oz. Polyester — Our entry-level marine cover fabric, woven from 100% polyester fiber at a 7 oz. per linear yard weight. This lighter option keeps the cover manageable for solo handling while still delivering reliable protection against sun, rain, and debris. Backed by a 3-year fabric warranty. Ships in Black.
9 oz. Polyester — Step up to our heavy-duty polyester, engineered at 9 oz. per linear yard for boats that face tougher conditions or extended outdoor storage. The denser weave adds an extra layer of defense against abrasion and weather without adding unnecessary bulk. Protected by a 5-year fabric warranty. Ships in Navy or Black.
Sunbrella® — For boaters who want the best, our Sunbrella covers use 100% solution-dyed acrylic — the same fabric trusted by marine professionals worldwide. Naturally resistant to fading, mold, and water damage, Sunbrella holds its color and integrity season after season. Covered by a 6-year fabric warranty. Ships in Black, Smoke, or Marine Blue.
Both polyester options feature solution-dyed construction, where pigment is infused into each fiber during production rather than applied to the surface afterward. This process locks color deep into the material, preventing any dye transfer to your boat’s gel coat or finish. The result is a cover that stays vibrant without bleeding or rubbing off. Our polyester is also designed to breathe — it allows moisture trapped underneath to vent out naturally, reducing the risk of mildew and keeping your boat dry. The fabric holds its form without sagging or stretching over time, stays lightweight enough for one person to handle, and stands up to prolonged UV exposure and harsh marine weather.
*The warranty periods above are provided by the fabric manufacturer and cover the material itself. For details on what’s included in the warranty for your completed cover, please see our warranty page.
| Weight | 42 lbs |
|---|
Install
Please watch the video below for installation instructions!
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Frequently Asked Questions
The 300 Marlin was Grady White's flagship walkaround — a 30-foot offshore fishing machine with a full cabin. At 7,200 lbs with a 10'3" beam, twin outboards up to 700 HP, and 300 gallons of fuel, the 300 Marlin could run 60+ nautical miles offshore, fish all day in canyon conditions, and provide overnight cabin accommodations. It combined the walk-around fishing access of a center console with the cabin comforts of a cruiser.
The 300 Marlin cabin is substantial for a walkaround: V-berth with full-size sleeping area, enclosed head with marine toilet and sink, galley area with sink and optional cooktop, cabin lighting, storage lockers, opening ports for ventilation, and a cabin door for privacy and weather protection. This makes the 300 Marlin a genuine overnight fishing platform.
With 300 gallons and twin Yamaha F300s at cruise, the 300 Marlin achieves 450+ miles of range. This supports serious multi-day offshore operations — running to distant fishing grounds, trolling along the continental shelf, and fishing the canyon edges with fuel to spare. The range makes the 300 Marlin competitive with dedicated sportfishing boats.
The 300 Marlin accommodates twin outboards up to 350 HP each (700 HP total). Twin Yamaha F300s are the most popular configuration, providing 50+ mph top speed with strong fuel efficiency. Twin F350s deliver maximum performance for tournament anglers. The twin-engine setup provides the redundancy essential for offshore walkaround fishing.
The walkaround bow provides 360-degree access around the entire boat — essential when fighting large game fish that run under the hull or change direction. The wide side decks, bow pulpit, and clear foredeck allow anglers to follow fish around the entire boat without obstruction. Combined with the fishing cockpit, rod holders, fishboxes, and livewell, the 300 Marlin fishes like a center console with the bonus of cabin protection.
The 10'3" beam provides excellent stability at rest and at trolling speeds — critical for drift fishing and fighting large pelagics. At 7,200 lbs with 20° deadrise, the 300 Marlin tracks confidently through 4–6 foot seas. The wide beam also creates a spacious cockpit and wide walkaround side decks for safe crew movement offshore.
The 300 Marlin's cabin top, windshield, walkaround side decks, and enclosed helm station create a more complex shape than standard center consoles. Perfect Fit's cover pattern accounts for every contour — the cabin top profile, windshield rake, side deck structures, rod holder positions, and transom hardware — to create a precision fit that protects both the cabin and the fishing cockpit.
Excellent. The SeaV² hull at 30 feet is built to outlast multiple sets of engines. Modern twin Yamaha F300 or F350 four-strokes provide significant weight reduction, 25–30% better fuel efficiency, and dramatically quieter operation. A repowered 300 Marlin with updated electronics and a Perfect Fit cover continues to deliver decades of offshore walkaround service.
The 306 Canyon is a pure center console designed exclusively for offshore fishing. The 300 Marlin adds a full cabin with sleeping berth, head, and galley — making it suitable for overnight trips and family cruising in addition to offshore fishing. Choose the Canyon for maximum fishing deck space and simplicity; the Marlin for the combination of serious fishing capability with cabin comfort.
The 300 Marlin's cabin components — berth cushions, head compartment, galley surfaces, cabin headliner, and ventilation ports — add significant replacement cost beyond standard cockpit and engine protection. On a discontinued model where these cabin-specific parts become increasingly scarce, a Perfect Fit cover prevents the UV and moisture damage that deteriorates cabin components fastest.
Grady White 300 Marlin T-Top Boat Cover
The Grady White 300 Marlin is a 30’0″ offshore walkaround that was Grady White’s flagship crossover platform. At 7,200 lbs dry weight with a 10’3″ beam, the Marlin is powered by twin outboards up to 350 HP each (700 HP total) and carries 300 gallons of fuel for 450+ miles of offshore range. The walkaround design provides 360-degree deck access with a full cabin below — V-berth sleeping area, enclosed head with sink, galley, and cabin lighting. The fishing platform delivers rod holders, insulated fishboxes, recirculating livewell, tournament-grade cockpit workspace, and a wide-open transom for offshore game fishing.
Your 300 Marlin requires a Perfect Fit custom T-Top cover engineered for the walkaround cabin profile and 10’3″ beam. Our cover wraps the full hull below the hardtop, protecting the cabin entry, berth cushions, head compartment, galley, helm electronics, cockpit surfaces, and twin-engine assembly from UV exposure, salt spray, and moisture. Solution-dyed marine fabric (5–7 years) or premium Sunbrella acrylic (8–10 years) preserves your offshore walkaround investment through seasons of canyon fishing and coastal cruising.
Offshore Walkaround — Canyon Fishing Meets Cabin Comfort
The 300 Marlin was designed for the angler who demands both offshore fishing capability and the convenience of a real cabin. The 300-gallon fuel capacity supports runs 60+ nautical miles offshore, while the cabin provides overnight accommodations with sleeping berth, head, and galley. The walkaround side decks give 360-degree access for fighting fish, and the SeaV² hull with 20° deadrise handles open-ocean conditions at 7,200 lbs displacement. Twin outboards up to 700 HP deliver tournament-grade performance with twin-engine redundancy.
Engineering & Walkaround Precision Fit
Perfect Fit’s cover engineers custom-measure your 300 Marlin’s cabin top profile, windshield rake, walkaround side decks, fishbox drains, livewell ports, rod holder positions, 10’3″ beam, and twin-engine transom layout to create a precision-fit pattern. The reinforced stitching and hem cord secure the cover at the rubrail, while heavy-duty adjustable tie-down straps distribute tension evenly across the wide beam. The aft section extends into a loose, draped pouch that envelops both engine cowlings as a single continuous covering without binding.
Explore the Grady White Collection
Perfect Fit Boat Covers offers custom covers for every Grady White model. Browse our full Grady White boat cover collection for all available models, or compare the Grady White 306 Bimini boat cover for a modern dual console platform. For a capable small center console, see the Grady White 20 Adventure CC boat cover.
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