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Hatteras GT45X Flybridge (2018-)

Brief Summary

The Hatteras GT45X Flybridge welcomes anglers back to the fold who are looking for a boat of less than 50’ (15.2 m) in LOA. She can also serve as a cruising boat with the added advantage of having a low CG and a large, open cockpit that can be used for entertaining as well as fishing. This boat is offered in single- or two-stateroom layouts. Let’s take a look and see how the GT45X Flybridge measures up to her stablemates.

Key Features

  • Standard twin Cat C-12.9 diesel engines
  • 800-gallon (3,028 L) fuel capacity
  • 17.0 kW diesel generator
  • Aft seating and cockpit with integrated grill
  • Open-concept cabin/galley
  • Bridge deck has optional third helm seat
  • Optional main cabin available with two staterooms


Length Overall 44' 7'' / 13.59 m
Beam 16' 6''
5.03 m
Dry Weight 49,700 lbs.
22,543 kg
Draft N/A
Deadrise/Transom N/A
Max Headroom N/A
Bridge Clearance N/A
Fuel Capacity 800 gal.
3,028 L
Water Capacity 100 gal.
379 L

Engine Options

Tested Engine Currently no test numbers
Std. Power 2 x 838-hp Caterpillar C-12.9 diesel
Opt. Power 2 x 985-hp Caterpillar C-12.9 diesels

Captain's Report

Hatteras GT45X Flybridge profile

The Hatteras GT45X Flybridge (shown) is a hot performer that can be dialed in to fish, and yet she can still cruise.


Hatteras has long been known for building motoryachts and sportfishing boats that can handle the rough stuff. The GT45X Flybridge shows Hatteras hasn’t forgotten much of anything that it has learned. Here’s the genius of this model: The offshore performance of a sportfisherman is not just for anglers anymore, since it’s just the ticket for providing a safe transport back to protected waters when the weather turns snotty. And with available layouts that can accommodate a family (with flexibility for additional guests), the package can serve as a hard-core tournament boat or a cruiser ready to take the crew up and down the coast, or out to the islands.

Hatteras GT45X Flybridge running

While the flybridge definitely expands fishing capability, she can also cruise as well as the other models in the line, thanks to the solid build and handling of a yacht designed to take on offshore conditions.

The Back Story

Most know the story, but for those who do not, it bears repeating since it has such a happy ending. Hatteras Yachts, a company with a longstanding reputation for building quality cruisers, was acquired by Brunswick, a large conglomerate of boat brands, in 2001. Things went well, but economics being what they are, Brunswick was forced to reduce staff and shop for a buyer. Ultimately, one stepped forward and, in 2013, Hatteras was sold to Versa Capital Management’s subsidiary, Navis HCY Acquisition LLC. This company is well funded and Hatteras was given the resources needed to tool new models and, essentially, do things right. Hatteras continued to grow both the GT line and motoryachts.

Fast forward to today, where we find Hatteras expanding its line of motoryachts and sportfishing boats, and, to that end, offering a versatile mid-size boat for those trading up from other brands who want the build quality, rugged construction, and prestige of the Hatteras brand -- as well as for those trading down from larger convertibles or motoryachts.

Features Inspection By the Numbers

All three Hatteras GT45X models have the same hull: LOA of 44’7” (13.59 m), a beam of 16’6” (5.03 m), a draft of 4’ (1.22 m). With the additional structural requirements in place to support a pair of SeaKeeper 6 gyros, plus the full flying bridge package, the empty weight of the Hatteras GT45X Flybridge is 53,400 lbs. (24,221 kg), or 3,700 lbs. (1,5739 kg) more than the express version of this boat.

All GT45X models come standard with the same power, a pair of 835-hp Cat C-12.9 diesel engines, and have the same options for other power choices, most popular being a pair of 1,136-hp Cat C-18 ACERTs. Fuel capacity is 800 gallons (3,028 L) and that feeds both the mains and the 17 kW generator. Both hold 100 gallons (379 L) of fresh water and 43 gallons (163 L) of waste.

Flying Bridge

To starboard of the aft bridge-deck settee is a ladder up to the flying bridge, where the upper helm station awaits. The pod-style helm is set up to match the lower helm, and there are seats for the helmsman and a companion beneath a hardtop.

To starboard is a bench settee for additional companions to enjoy the breeze, and there’s seating for two in front of the helm console. All told, the flying bridge can accommodate six people.

Hatteras GT45X Flybridge layout

The flying bridge on the GT45X Flybridge is designed to fit the boat and give the skipper an excellent view of the cockpit action.

The flying bridge is the right size for this boat, fitting atop the deck house in proportion with the rest of the boat, right down to the hardtop overhead height. The captain can watch the angling action from the helm, adjusting the boat’s position as needed.

Hatteras GT45X Flybridge stern

The Hatteras GT45X Flybridge adds an upper deck to the fishing party. The coachroof now serves as the flybridge deck and has a crown that sheds water and adds strength.

One Cabin or Two?

Hatteras GT45X Flybridge one cabin layoutHatteras GT45X Flybridge two cabins

Choose the GT45X Flybridge in either one or two cabin layouts.

Moving to the lower-deck accommodations, all models in the GT45X line offer identical choices. Entering by the three-steps-down companionway just to starboard of the helm, the well-equipped galley is immediately to starboard. The head is located just forward. To port is an L-shaped settee wrapping around a minimalist teak pedestal table.

Here’s where two layouts are offered, depending on whether the GT45X Flybridge will be used more as a couples’ cruiser or as an overnighter for four people. By eliminating some length of the settee on the forward end, a separate cabin can be added to port that features a pair of over/under berths in an enclosed stateroom.

Master Stateroom

Fully forward is the master stateroom with an elevated island berth, allowing access from both sides. A variety of wood finishes are complemented with a teak and holly sole to highlight the entire area.

Hatteras GT45X Flybridge bunk

With the two-stateroom layout, this double-berth cabin is added and takes up a small portion of the port side settee.

Hatteras GT45X Flybridge galley

The galley is located to starboard with the master forward. Natural light comes from three overhead skylights. The settee to port wraps around a pedestal table and we’d choose a version with expandable leaves for better functionality as a dining table.

Hatteras GT45X Flybridge galley

The galley features a sink, microwave, refrigerated drawers, and a flat-surface two-burner ceramic cooktop. Choose from a variety of wood finishes.

Hatteras GT45X Flybridge refrigerator

Additional refrigerated storage is at the aft bulkhead.

Hatteras GT45X Flybridge island berth

An island berth makes up the forward master stateroom. Storage is abundant throughout. Natural light is overhead.

Hatteras GT45X Flybridge head

The head features a separate walk-in shower. Counters match those in the galley.

Helm Deck

Moving up to the helm deck, the GT45X Flybridge has a molded deckhouse with an integral flybridge. The helm is mounted in the center of the deck with a single operator’s seat, providing an elevated vantage point for good visibility. A companion seat faces forward to starboard in front of a console with storage lockers.

Hatteras GT45X Flybridge main deck

The main deck features an elevated helm deck and a spacious cockpit, both well suited as social areas.

A fiberglass console or high-gloss teak one can be chosen. Both have Palm Beach-style sticks to the sides. A polished metal switch panel is etched with labels denoting the function of each switch. Engine displays are just ahead.


Hatteras isn’t married to any one electronics provider, so owners are free to choose from their favorite and plenty of open real estate in the panel will easily accommodate large flush-mount displays. To the sides are the ancillaries such as autopilot, VHF, etc…

Hatteras GT45X Flybridge lower helm

The lower helm allows for a fair amount of options. Seen here are two versions, one is a fiberglass console, the other is varnished teak. Both put the CAT engine displays forward of a row of toggle switches. Palm Beach-type throttle-and-shift controls are to the sides.

Guest Seating

A massive L-shaped settee wraps around the entire port side and at the forward end provides an aft-facing lounge. To starboard is an observer’s seat, allowing for a companion to take part in the navigation. Both the helm and observer’s seats are fully adjustable, high-end Stidd helm chairs.

The deck is enclosed on three sides with windows that blend seamlessly into the sides and the stylish fiberglass hardtop. The open aft section can be closed off with Isinglass for three-season comfort. Fresh air is available on the enclosed deck through opening side windows that are hinged from the rear to scoop air into the deck while underway or at anchor, and an overhead hatch. Otherwise, many will opt for the reverse-cycle A/C system to maintain climate-controlled comfort. An engine room access hatch is located in the center of the deck.


Most notable, however, is the massive single-piece windshield providing a view ahead without the encumbrances of a center window mullion.


The cockpit is accessed from the bridge deck by a walkthrough, offset slightly to starboard with three steps leading down to the cockpit sole. There's plenty of open space, allowing this deck to be used for various purposes, most obviously big-game fishing, but also for relaxing and entertaining.

Hatteras GT45X Flybridge cockpit

The spacious cockpit has mezzanine seating that has become a must-have on sportfishing boats.

Hatteras GT45X Flybridge fishing

The cockpit has plenty of room for fishing.

All decks are teak. There’s a second engine-room access point through a hatch in the mezzanine seat. An elevated bench seat on the mezzanine level provides an excellent vantage point to the cockpit for observing the fishing action or simply being in a relaxed position while still being part of the party. This also provides a comfortable place for guests to relax while watching the wake shrink into the distance.

In the cockpit, the deck is reinforced to accommodate a fishing chair or a teak pedestal leaning post/rocket launcher in the center. Either will become the focal point of any fishing expedition.

To the starboard side, a rigging station also includes an electric grill for preparing the fresh catch for the dinner table. Under the deck is a pair of insulated fishboxes. In the transom is a molded-in 56-gallon (211.98 L) livewell.

The Cockpit for Entertaining

We should emphasize that the cockpit of a sportfisherman is probably one of the most convivial locations on any boat of any size for a relaxed cocktail party. It is large and stable, and there is plenty of room to set up tables for beverages, ice, and finger food. We recommend adding a fold-up bench seat or two for the ladies, as we have found that women tend not to like to sit on the covering boards, as men do.

Fold out seats could also be installed in the port and starboard gunwales (as we are now seeing on smaller boats). We’d ask Hatteras to make them for us to add utility to the boat.

Hatteras GT45X Flybridge leaning post

Choose from this center-mounted teak leaning post or a fighting chair mounted to the backing-plate reinforced deck.

Engine Room

The engine room is built around twin Caterpillar C-18 ACERTs rated for 1,136-hp each. There’s 57” (1.45 m) of overhead clearance, what our test captain would call stooping headroom, and 7.5” (.19 m) of clearance over each engine. There’s room to gain access to all sides of each engine. The Racor fuel-water separators and battery boxes have been repositioned from what we saw in a test of a sistership, the GT45X Tower model. By positioning the battery boxes in front of each engine, there’s now mounting room to place one of two Seakeeper 6 gyro stabilizers.

Hatteras GT45X Flybridge engine room

The engine room is designed to provide good access to all sides of both port and starboard 1,136-hp Caterpillar C-18 ACERT diesels.

Performance and Handling

Trolling valves are effective and take our test boat’s idle speed from 7.2 knots to 3.1. Once through the inlet, and beyond, it quickly became apparent that the 25-knot winds were kicking up seas that would make getting reasonable performance numbers problematic. But it did show us that the GT45X does handle rough conditions quite well. She had no pounding, it was a bit of a wet ride, but more to the point was how solid she felt. It was as if the whole boat was absorbing the waves, which makes sense considering how strongly these boats are built.

Hatteras GT45X Flybridge wind

On our test, the wind really kicked up the seas. While our test captain couldn’t get performance numbers, he gained a greater understanding of the GT45X as a solid sea boat.

Coming around to the beam showed a more relaxed posture of course. While the best times were, not surprisingly, in the following seas. That’s where we could really pick up the speed and let her run. No hint of the bow stuffing, and of course, a much drier ride. Now given that we couldn’t get our own numbers, let’s look at what the team at Hatteras report. They got these speed and fuel consumption numbers in calm conditions, we were told.

Hatteras GT45X Flybridge performance data

Performance numbers from Hatteras’ techs supplied to BoatTEST.

With a full load of fuel, the Hatteras techs topped out at 40.8 knots. A throttle setting of 2000 rpm put the 1,136-hp CAT C-12.9s at the recommended cruise setting of 80% load and 36.0 knots. At that speed, the 92-gph fuel burn translated into a range of 281.9 nautical miles. Interestingly, the efficiency of the hull is highlighted in the difference of only one-tenth of a NMPG between full speed and all other throttle settings. In effect, we can really set the speed based on the prevailing conditions.

Hatteras GT45X Flybridge sightlines

The flybridge of the GT45X gave good sightlines all around the boat, including a view aft that will serve angling purposes very well.

Our experience with Hatteras convertibles of this size is that 20 knots is generally a comfortable and relatively economical speed at which to travel. That reduces fuel consumption to something in the 40 gph range.

Around the Dock

Coming back into the marina basin was, again, a simple affair of using the separate sticks to control the GT45X. On approach to the dock, our test captain added a small bit of port rudder to allow him to favor the starboard side finger pier. Then he just guided her back with alternating shots of reverse to steer, and jolts of forward gear to have her large props kick her over to starboard. There is really no need for a joystick. And this was with that 25-knot crosswind.

Hatteras GT45X Flybridge props

Control around the dock with large props and rudders means easy maneuvering, even in a crosswind.

It should be remembered that twin-screw boats of this size and much larger have been threaded through needles for more than 100 years without the need for joysticks. It is just a matter of learning how to use the throttles, rudders, and gears.

While our test captain didn’t get the numbers he came for, in our opinion, he did come away with an appreciation of how easy it is to handle the GT45X Flybridge, and how easily managed her systems are. It all speaks of a comfortable boat to own and operate.


If there was ever a “best of all worlds” boat, then the Hatteras GT45X Series is certainly a representative example. Whether the interests lie in offshore fishing or cruising, this yacht can be rigged to do either, and can easily do both, seamlessly transitioning from one to the other with little more than a hose down to facilitate the changeover.

All models in the GT45X lineup also represent the company’s forward thinking in taking an existing model, and making it better by taking the lessons from a lifetime of boatbuilding and incorporating the details into one exquisite boat. The result is a true Hatteras that brings the builder back into the realm of offering a sub-50-footer, something it hasn’t done since the late 1990s, and places the brand back within reach of a great many fans of the brand.