The Marlin 300’s SeaV2 hull and overall design make it an offshore saltwater fishing vessel first and foremost. The 30’6” (9.30 m) LOA and cabin below deck are a marriage of practicality and convenience. Perhaps the most important thing about the Marlin 300 is that it is a lot more comfortable -- dryer and safer -- for extended trips far offshore for bluewater fishing. Because she is not an open boat, when the sea gets rough and confused, her closed foredeck and protected bridge and cockpit make her a welcome alternative to any center console on the market.
The addition of Strataglass between the windshield and the hardtop allows the bridge to be buttoned up for a cozy ride home when weather turns foul. In addition, the square footage in her cockpit is greater than what is found in most center consoles her size between the lead post or bait-prep station and the transom.
The added advantage of the design is that she has an enclosed head with sink and shower, a full galley, and a U-shaped seating area with a convertible table for dining which can be made into a double berth. Another berth is amidships. For this reason, the Marlin 300 can also be used for cruising and even short weekend over-nighting.
A “Walk Around”. The Marlin 300 is the largest boat in Grady-White’s “Walk Around” series, but frankly, we think of her more as more of an express fishboat. “Walk Around” refers to the side decks which are recessed to provide secure footing when working a fish around the boat. We think these side decks are an excellent compromise between an express and a center console. For all of these reasons we find that she provides a lot more utility than the ubiquitous center console.
- SeaV2 Hull Design. The hull was designed by C. Raymond Hunt and Associates which knows as much about designing a deep-V hull as any firm on the planet. Her high deadrise forward which warps to a moderate deep-V aft to combine stability with riding comfort.
- Below Deck Features. The Marlin 300 has two berths, miniature galley, full head with a shower, dining space, storage, with optional air conditioning, and entertainment platforms.
- Aft Fishbox. Along the transom is the 300’s 290-quart (275 L) aft insulated fishbox. It comes standard with a light and overboard drainage.
Stern/ Swim Platform
The stern of the Marlin 300 is nearly all engine with a stainless steel re-boarding ladder on the starboard side. The ladder is molded-into the fiberglass platform, and just below it begins the 300’s rub rail, which circles the entire boat and is made of high-quality PVC with a stainless steel insert.
Just forward of the re-boarding ladder is the transom door. The stout door is made of fiberglass with a heavy-duty stainless steel latch on the inside just below the cockpit bolster that extends to include the transom door. The door opens out, which we prefer so it does not restrict cockpit space and can be used in emergency dewatering.
The cockpit on the Marlin 300 is the primary fishing space, and is broken up forward by two steps up to the helm deck and access to the cabin below. A bolster wraps around the cockpit with four dedicated rod holders mounted into the reinforced gunwales. Rod racks are under both gunwales. Just below these are toe rails that can be used when hauling in the big one. On the hardtop legs, two to each side, are stainless steel rocket launchers.
Along the transom is the freshwater cockpit shower. The majority of the transom panel, however, is taken up by the 300’s 290 quart (274 L) fishbox, which has LED lights and drains overboard. On the port end of the transom is a lift-out storage bin under a fixed cutting board. Under the bin is access to two battery banks with four batteries.
There is a fold-down bench seat facing forward on the transom as well with marine-grade weather-resistant upholstery. Below the seat is an access hatch to levered seacocks and the 5 kW generator.
The levered seacocks are a very good idea and something that we only rarely see. They enable the seacock to be turned off quickly in an emergency without having to fish around for a long reach to the thru-hull. More builders should use this concept when not able to put the seacock within easy reach.
Cockpit Details. Forward the rod holders in the gunwales are fiberglass steps up to the side decks on each side. Adjacent to the steps up to the helm on the centerline on each side are two stations: to port is a 32 gallon (121 L) insulated raw water livewell with a light, full column distribution inlet, and overboard drain; to starboard is a rigging station with a freshwater sink, insulated bait box, and lockable drawers. For both, cushions can be easily installed just on top, creating additional cockpit seating space.
Two fiberglass steps up in the center of the boat from the cockpit to the helm. The bottom step lift up to reveal storage space below.
Helm/ Under the Hardtop
Bridge Seating. The Marlin 300 comes standard with two Deluxe II helm seats, which are both horizontally and vertically adjustable, with armrests that can flip-up and out of the way. Both helm seats have lockable storage spaces in their bases. The boat we tested had optional Command Elite seats (shown above) that are horizontally and vertically adjustable with deluxe cushioning for smoother ride. Flip up bolsters, too. We recommend this option.
Optional Port Design. Grady-White also offers the option to eliminate the companion bridge seat and replace it on the port side with a lounge seat that has a backrest that faces forward but also wraps along the portside gunwale for versatility in a social setting.
The hardtop comes standard on the Marlin 300 and comes as a painted aluminum frame, with radio box, storage nets, spreader lights, four side mounted rod holders, outrigger plates, and drop, front and side curtains.
The helm station has a stainless steel steering wheel with throttle just to starboard on the forward flat panel. A compass divides the dash’s flat panel. Rocker switches and the standard trim tab controls are to the right.
Grady-White offers the Yamaha Helm Master as an option on the Marlin 300.
Captain Grady. One of Grady-White’s big innovations is their Captain Grady system, which works on either an iPad or iPhone or other smart devices as an app and provide operations guides, FAQs, and troubleshooting.
Forward, the windshields are ventilated tempered glass, with windshield washers and two standard windshield wipers.
Access to the cabin comes via three fiberglass stairs to port of the helm station. The decks on the 300’s lower deck are teak and holly (standard), and immediately to port upon entry is the boat’s galley. It has a microwave, glass electric top stove, refrigerator, Corian countertop, stainless steel sink, and trash drawer. Above is storage behind sliding cabinet doors.
Midships Berth. Immediately to starboard off the access stairs, through a duck-down entrance, is the aft double berth, which has netted storage on the far wall, as well as rod storage overhead.
Opposite the galley on the starboard side is the 300’s enclosed head. It has a sink, shower, and lamp, with a VacuFlush marine head that has a 10-gallon (38 L) holding tank and pump-out.
Dine or Sleep. Forward below deck is a dining space that can convert to a V-berth. The “C” shaped seating section wraps around a cherry wood table and has a backrest wrapping around the entire space. The table can be adjusted down to be level with the seating, allowing the addition of a filler cushion for conversion to a berth.
Removal of the cushions in the seating section itself reveals storage cubbies below.
Overhead are two reading lights, as well as three rod storage racks to each side, which flank the opening overhead latch that has both a screen and a shade depending on desired level of natural light and fresh air.
The Marlin 300 is a walkaround cuddy cabin, and from an easy step-up in the cockpit you’re up onto the side-decks, with the 316 grade stainless steel guide rails extending all the way up to the foredeck.
On the bow, just forward the windshield, is the opening Bowmar hatch above the lower deck V-berth. This surface can also be covered with the optional cushions and converted into a seating space.
Forward the seating space is the anchor windlass, which has foot controls to port (as well as controls at the helm), and a bow pulpit that includes a roller. To the starboard side of the windlass is the anchor locker, under a hatch with a stainless steel latch.
The Marlin 300 offers three choices for power:
- Yamaha Twin 250-hp Four Stroke
- Yamaha Twin 300-hp Four Stroke
- Yamaha Twin 350-hp Four Stroke
- Cabin air conditioner 8,000 BTU
- Bow thruster
- 19” LED-LCD HD TV with DVD player (cabin)
- Generator -- 5 kW diesel, 12 gallon (45.4 L) fuel capacity
- Yamaha Helm Master controls
- Outrigger kit – 15’ (4.6 m) crank outriggers hardtop mounted
- Outrigger kit – 15’ (4.6 m) radial hardtop mounted
- Six additional painted hardtop top mounted rod holders
- Upgrade Helm Chair(s): Command Elite horizontally and vertically adjustable contoured helm chair with deluxe cushioning and flip-up bolster
- Power steering
- Top speed for the Grady-White Marlin 300 (2017-) is 50.0 mph (80.5 kph), burning 52.7 gallons per hour (gph) or 199.47 liters per hour (lph).
- Best cruise for the Grady-White Marlin 300 (2017-) is 27.6 mph (44.4 kph), and the boat gets 1.5 miles per gallon (mpg) or 0.64 kilometers per liter (kpl), giving the boat a cruising range of 390 miles (627.64 kilometers).
- Tested power is 2 x 300-hp Yamaha V6 4.2L.
With a pair of Yamaha V6 4.2L 300-hp engines powering our test boat, we had an estimated test weight of 10,615 lbs. (4,815 L).
Our top speed at wide open throttle was 43.4 knots.
Best cruise came at 3500 rpm where we recorded 24.0 knots, burning 18 gph (68 lph), getting 1.3 nm per gallon (4.9 LPNM) for a range of 338 nmiles with a 10% fuel reserve.
She was fast on plane -- 3.0 seconds, hitting 20 mph in 3.9 seconds and 30 mph in 6.9 seconds.
Options to Consider
Check with your local Grady-White representative for a price quote.
The Grady-White Marlin 300 has passed the test of time. The builder first introduced this series over 30 years ago and they are still in the lineup -- but changed and updated over the years. That is saying something as most boat models last from three to seven years before they are discontinued.
At 30’ (9.14 m) this vessel is big enough, and seaworthy enough to take from Florida down island.
The Grady-White Marlin 300 is a top-flight fishing boat, with plenty of amenities aimed at such an excursion.
Test Result Highlights
Standard and Optional Features
|Washdown: Fresh Water||Standard|
|Washdown: Raw Water||Standard|
|Outlet: 12-Volt Acc||Standard|
Boats More Than 30 Feet
Full Warranty Information on this brand coming soon!
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