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Boston Whaler 315 Conquest (2019-)

2 x 300-hp Mercury Verado

Brief Summary

More and more people are heading offshore or down the coast and not coming back until the next day, or the day after that. For that reason, boats with a fishing pedigree are finding a lot of appeal among the cruising set. Boston Whaler's new 315 Conquest successfully bridges the gap between an offshore-capable fishing boat and a comfortable cruiser. We recently took her offshore for a test and found her to be an excellent handling sea boat. Take a look at a full test and performance review video.

Key Features

  • 28" interior freeboard
  • Acrylic transom door
  • Cockpit starboard side prep center with sink and storage
  • Covered telescoping stainless steel swim ladder with stainless steel grab rail
  • Transom mounted stainless steel rod holders (3)
  • Instrumentation and electrical switch panels with circuit breaker protection
  • Helm seat with cushions and adjustable slider
  • All hardware 316-L stainless steel
  • All rails welded 316-L stainless steel
  • Integrated windshield and hardtop

Test Results

550 2.6 2.3 0.95 2.74 2.38 717 623 62
1000 4.8 4.2 2 2.4 2.09 629 547 64
1500 7.3 6.3 3.55 2.06 1.79 539 468 69
2000 8.9 7.7 5.45 1.62 1.41 425 370 70
2500 10.4 9 9 1.15 1 301 262 73
3000 14.3 12.4 12.95 1.1 0.96 288 251 83
3500 16.7 14.5 15.8 1.06 0.92 277 241 81
4000 29.7 23.2 19.85 1.34 1.17 352 306 82
4500 33.2 28.8 24.55 1.35 1.17 354 308 82
5000 38 33 32.85 1.16 1 303 263 83
5500 42.5 37 42.9 0.99 0.86 259 226 85
6100 47.5 41.3 60 0.79 0.69 207 180 86


Length Overall 31' 3'' / 9.53 m
Beam 10' 8''
3.25 m
Dry Weight 8,800 lbs.
3,392 kgs.
Tested Weight 11,426 lbs.
5,183 kg
Draft 20''
0.51 m
Deadrise/Transom 20 deg.
Max Headroom N/A
Bridge Clearance 9' 0''
Fuel Capacity 291 gal.
1,102 L
Water Capacity 46 gal.
174 L
Total Weight 11,426 lbs.
5,183 kg


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Acceleration Times & Conditions

Time to Plane 4.2 sec.
0 to 30 9.5 sec.
Ratio 1.85 : 1
Props 14 5/8 x 17 Rev 4
Load Load: 2 persons, Fuel: 1/2 full, Water: none, Gear: 50 lbs.
Climate Temp: 85 deg., Humid: 89%, Wind: 5-10, Seas: light chop

Engine Options

Tested Engine 2 x 300-hp Mercury Verado
Std. Power 2 x 250-hp Mercury Verado Four-Stroke
Opt. Power 2 x 300-hp Mercury Verado Four-Stroke

Captain's Report

Contents of Report

Captain's Report by Capt. Steve--

Mission Statement

The mission of the 315 Conquest is to provide an offshore cruising platform with an open layout that can also easily crossover into the fishing realm. As recent customer purchases have shown, the days of single-purpose boats seem to be behind us, and more and more people are gravitating towards fishing platforms for their stability, dry ride, and protection from the elements. The 315 Conquest seems to meet all those points, and more.

Boston Whaler 315 Conquest

The 315 Conquest is not only good looking boat but she also has a solid feel and has good handling offshore.

Distinguishing Features

Some of the key unusual features of the 315 Conquest include:

Choose your layout.

Our test 315 Conquest featured a "summer kitchen" that really brings the cruising capabilities of this boat to light. If you decide that you're going to be heading more towards a dedicated fishing mission, then swap out the summer galley for a rigging station.

Choose your cabin style.

Additionally, the helm deck can be outfitted with sloping Downeast-style side windows as on our test boat, or have windows that go all the way up to the hardtop. A third option is to go with a fully-enclosed helm deck including an aft bulkhead with door.

291 gallon (1102 L) fuel capacity.

This is one of the highest fuel capacities in class and therefore gives the 315 more endurance than others. At best cruise speed she can keep running for over 9 hours.

Clever passenger seating.

On the port side of the helm deck there are booth-style seats facing forward and aft. A filler cushion turns the seats into a lounger, as you see on most express boats, and a clever fold out table recessed into the bulkhead makes this seating area into an impromptu snack area or, in my case, a workstation.

Boston Whaler 315 Conquest

The standard flip up transom bench seat stows and deploys easily. Notice the beefy stainless steel hardware. Picture one of these to port and starboard as options for entertaining.

Optional cockpit bulwark fold-way bench seats.

This is something rarely seen on any size boat and is one of the most practical ways to convert a fishing cockpit into a cruising cockpit or a comfortable entertaining space. The 315 Conquest has optional port and starboard fold-away bench seats that can be nestled into the bulwarks which turns the cockpit into a terrific entertaining area.

Fully foam-cored hull and deck bond.

Boston Whaler mates the hull and deck with an expandable foam that bonds the two components together not just at the hull-deck joint around the perimeter of the vessel, but all over its deck surface. It's an unusual process, and one that you can see live in our Boston Whaler factory tour video. (See construction video.)

Level flotation.

The USCG only requires boats 20' and under to float level. Those over 20' don't have to float at all if swamped. The 315 Conquest not only floats if swamped, but Boston Whaler assures us that she'll floats level as well.

28" (71.1 cm) cockpit depth.

ABYC standards call for 24" (60.9 cm) of protection above a weather deck. Boston Whaler takes it a little further and adds 4" (10 cm) more of security.

Boston Whaler 315 Conquest

Boston Whaler has packed a lot of boat into 31' and with her standard hardtop she will be able to take owners virtually anywhere they want to go.

Performance and Handling

Our Boston Whaler 315 Conquest has a length overall of 31'3" (9.5 m), a beam of 10'8" (3.3 m), and a draft of 20” (.5 m). She has a deep-V hull with 20-degrees of deadrise at the transom. With a hull weight of 8,800 lbs (3392 kg), three quarters fuel, two people, and optional twin 300-hp Mercury Verados onboard we had a test weight of 11,426 lbs (5183 kg).

Speed numbers.

Those twin Verados brought us to a top speed at 6100 rpm and 47.5 mph. At that speed we were burning 60 gph for range of 207 miles. Best cruise came in at 4500 rpm and 33.2 mph. At that speed I measured the fuel burn to be 24.55 gph which translates to a range of 354 statute miles. We had a quick time the plane of only 4.2 seconds, reached 20 mph in 5.6 seconds and accelerated 30 mph in 9.5 seconds.


While we didn't have any chop to speak of offshore there were several swells from offshore winds that gave us some indication of how the 315 performs in a seaway. She has excellent wave penetration while throwing spray well off to the sides and down low providing a nice dry ride.

Boston Whaler 315 Conquest

The side decks are an area where a builder usually cheats to provide more interior space, not so with Boston Whaler.

With enough speed I was able launch off some of the swells and noticed that the 315 maintains a level attitude throughout her reentry. There's a 13-degree bow rise upon acceleration which brings the bow up to just below the horizon. Once at cruise she settles into a 5-degree bow-high attitude and she has a maximum bank angle of 10-degrees in a full power turn.
When taking power off she settles back into the water slightly stern first with the bow following shortly after, again producing no loss of visibility to the horizon. All in all these are the makings of an excellent sea boat that was a joy to operate.

Features Walk-Through


At the working end of the bow, Boston Whaler went with 25" (63.5 cm) rails that will keep you secure as you’re working the ground tackle. There is a standard stainless steel anchor roller and an optional anchor windlass mounted atop the foredeck. The 315 is outfitted with 10-inch (25.4 cm) cleats, and Boston Whaler provides midship cleats as well. There's a hatch to the starboard side of the windlass for managing tangles and this compartment also houses the windlass remote.

Boston Whaler 315 Conquest

The bow rails are angled outward and I found that when handling lines, leaning against the rails makes you want to step on the smooth slanted deck that the rails are mounted to. A small elevated toe rail gives you warning of where the nonskid section of the deck ends, but to lean against the rails you need to step outside that section. The anchor windlass with rode is standard.

There's a nonskid area on top of the trunk cabin that will accommodate a large sunpad that folds in half for easy storage.

Visibility and Protection -- The Coup de Grâce

To me, a lot of the appeal of the 315 Conquest has to do with the amount of glass surrounding the helm deck. I'm just not a big fan of isinglass. The windshield is in two pieces and both are huge, giving great sightlines. What's more, the mullions are quite narrow which gives more of an uninterrupted field of vision. Pantograph wipers to port and starboard are standard and have integral washers.
At the top of the tempered glass is an electric vent that did a remarkable job of forcing air into what would otherwise have been a greenhouse heated helm deck. While our test boat was fitted with sloping side windows that were reminiscent of a Downeast design, you can get windows all the way to the hardtop as well as a fully enclosed helm deck with an aft bulkhead and door, as mentioned.

Boston Whaler 315 Conquest

Notice the large tempered glass windshields and narrow mullions. At the top you can see the electrically actuated vent that scoops air into the helm deck. The remote spotlight and radar on top of the standard hardtop are both optional. Dual windshield wipers with washer system are standard.

Side decks

As you make your way aft, the side decks were ample at 14" (35.6 cm) and the combination of the high stainless rails, grab handles running along the length of the hardtop, and ladder-type hardtop supports made a very comfortable transition. A channel is molded into the side deck that directs normal spray and splash coming over the bow back overboard before reaching the cockpit. Of course if the volume of water overwhelms these side deck channels, then sizable deck drains will evacuate any remaining water overboard in short order.

Boston Whaler 315 Conquest

Any water coming over the bow will get channeled over the side.

Boston Whaler 315 Conquest

Safety on the side decks was not lost on Boston Whaler as the high side rails, lengthy grab handle on the overhead and aft hardtop supports all make for a safe transition.


The cockpit measures 59 sq. ft. (5.5 sm) and is comfortable for either fishing or relaxing. Our test boat was fitted with an optional shade that extended manually from the aft end of the hardtop. There are two large in-deck fish boxes to port and starboard and both are macerated. Cruising-only folks will use these boxes for storage. In the center of the deck is a large hatch leading to a spacious mechanical compartment. Inside this compartment are the macerator pumps, bilge pumps, fuel manifolds, engine start and house batteries, and the optional 7kW generator.

Boston Whaler 315 Conquest

The cockpit is roomy and can be set up for fishing or entertaining. There are macerated fish boxes to both port and starboard. When not used for fish they make good storage compartments. Cockpit coaming bolsters are standard.

Boston Whaler 315 Conquest

Behind the transom are flush mounted rod holders and you can see the shore power inlets to the port side. Notice the horizontal service deck running along the bottom of the transom. A cockpit shower is standard as is the raw water washdown with coil hose storage.

Boston Whaler 315 Conquest

Toe rails give you a little bit more support when fighting the fish and optional downrigger weight holders can be installed in the aft section.

Boston Whaler 315 Conquest

If the sun gets a little too hot there is an optional manually actuated sunscreen that extends from the aft end of the hardtop. My left hand is on the hand crank bringing the shade out. A cockpit flood light, dome light and rod holders are all standard.

Boston Whaler 315 Conquest

A hatch in the center of the cockpit deck exposes the mechanical room. Notice the optional 7 kW low-CO gas generator to the stern. The pressure water pumps are here along with the standard high-water alarm and stern bilge pumps.

Boston Whaler 315 Conquest

At the port quarter is a standard insulated livewell with rounded edges and blue interior to reduce the shock effect on the live bait. Cruising-only owners can use it as a cooler.

Boston Whaler 315 Conquest

Below the gunwales you can see connector boxes for electric downrigger's and notice the 10" (25.4 cm) cleat below the stainless hawsehole. With the flip down bench seat stowed into the transom you can appreciate how roomy this cockpit is.

Fold-away seating.

The entertainment capabilities really come into play with the standard fold-away stern bench, but most boats in class offer this feature. What virtually no builder (I can think of only one other in a far larger boat) offers in any size boat is optional fold-away seats in the cockpit bulwarks to port and starboard. By eliminating the rod holders and putting in these fold-away seats the cockpit is transformed into an incredible entertaining venue. With three sides of the cockpit accommodating seating, you really have an intimate gathering area.
I have heard men say, "just sit on the coaming when having a party." But they miss the point -- the coaming is 28" (70.6 cm) off the deck! This is not a comfortable height for most women, particularly those wearing dresses. Women will love this option and it adds so much utility to the boat that I would not buy a 315 Conquest without them.

Boston Whaler 315 Conquest

An electric smoke-free grill with storage underneath makes a handy cooking spot in the cockpit. Above and to the right is the stainless release latch to close the drawer. Just close the mirrored cutting board first.

Summer Kitchen

This option replaces the portside rigging station with a pullout cockpit grill and cutting board on top of the storage drawers. To starboard is a sink recessed into a Corian countertop, and a cockpit refrigerator is under the sink. It's a handy place to be preparing a meal on deck, and for that matter cooking up your fresh catch. There is a hinged cutting board on top of the grill.
I would go for this option. Like the optional fold-away seats this clever option greatly improves the utility of the boat, turning a 31-footer into nearly a full-blown cabin cruiser.

Boston Whaler 315 Conquest

Here you can see the optional pullout grill just behind the forward facing helm deck seat. Notice the two opposing seats on the port side. The starboard side sink can be seen just behind the helm seat.

Boston Whaler 315 Conquest

To starboard is a sink with pullout sprayer and a cockpit refrigerator just beneath. With a 46 gallon (174 L) water supply you don't have to be shy about cleaning.

Helm Deck

Boston Whaler really went all out on the helm seat for the 315 Conquest. It's on an elevated pedestal mount, swivels and slides, has cast flip-up armrests, and flip-up bolster. The back is vented so even on a hot day you won't get sweaty just from sitting.
The most comfortable part about the helm layout had to be the mounting position of the stainless wheel. I had it tilted nearly horizontal which allowed for a full range of motion throughout the five-turn swing from lock to lock. Mercury’s digital throttle and shift system (DTS) offered a wide range of options including sync, single lever and troll modes.

Optional generator.

As our test boat was fitted with the optional generator, it was also fitted with the optional 8000 BTU reverse cycle air conditioner which kept me warm going out to the test grounds and cool coming back in. Dual vents are located on the starboard bulkhead. Twin 12" (3.5 cm) hybrid-touch nav displays are on the upper panel and the optional autopilot was just ahead of the wheel. Mercury's SmartCraft display was to the left.
(Added points: those hybrid touch displays were easy to use. I've always been more comfortable pushing buttons than touching a delicate spot on a screen, particularly on a boat that is bouncing through waves. These units gave me the ability to do both.)

Boston Whaler 315 Conquest

This was one of the most comfortable helm seats I've seen in a long time.

Boston Whaler 315 Conquest

A well laid out helm made for comfortable operations. Notice the reverse cycle air conditioning vents on the starboard bulkhead. Our test boat was fitted with the optional bow thruster, the control is just to the left of the wheel.

Boston Whaler 315 Conquest

Mercury's SmartCraft Vessel View display is right next to the optional autopilot.

Boston Whaler 315 Conquest

Our test boat was fitted with the optional Taco Grand Slam outriggers with 15 foot poles. Pull this handle down and you can swing the outriggers out.

Port Companion Seats

To the portside are booth-style seats -- a double wide facing forward, single wide facing aft. Below the forward facing seat are the ship's batteries and main circuit breakers. A filler cushion will turn these two seats into a full-length lounger, much as you would see on your basic express cruiser. This seating arrangement, however, one-ups the express cruisers with the addition of a concealed table that retracts from the port side bulwarks. This is a clever feature, ingenious in its simplicity as it turns the two seats into an impromptu snack area, or in my case a workstation.

Boston Whaler 315 Conquest

To the portside are opposing seats with the ships’ electrical panel located underneath. Under the aft facing seat you can make out a portlight leading to the below decks mid cabin.

Boston Whaler 315 Conquest

This table pulls out from the bulwarks and is a stroke of genius that I suspect we'll see repeated from other builders in the future.

Overnight Accommodations

Down below are comfortable accommodations for one couple, and easily expandable for two couples or a small family. It begins with the mid berth. Measuring 4'8" (1.42 m) by 5'3" (1.6 m), the mid berth is tucked under the helm deck behind a floating tread staircase that eliminates any feelings of claustrophobia. An optional cabin comfort package is offered which includes a fitted sheet and comforter, privacy curtain, and regular size pillowcases. There is a variable geometry overhead to the mid berth which starts at 2’ (.6 m) at its lowest position, rising to 2'9" (.8 m) over the pillows and 4'1" (1.2 m) at the entryway.

Boston Whaler 315 Conquest

A center mounted companionway with sliding door allows access to the lower deck accommodations.

Boston Whaler 315 Conquest

While the mid cabin is tucked under the helm deck it was open and roomy enough to make it comfortable to get in and out of and allay any feelings of claustrophobia.

Boston Whaler 315 Conquest

The galley was modest but appropriately sized for boat in this class. The stove-top burner is optional.

Boston Whaler 315 Conquest

The 22 inch flatscreen TV is part of the optional entertainment package that also includes a DVD player, and cable TV input. The table is standard.

Moving out into the cabin area and to port is a modest galley with the usual accommodations of sink, optional one-burner stove top, standard microwave and dual voltage refrigerator. The countertop is Corian which provides a nice contrast to the wood grained cabinetry.
Forward is a U-shaped dinette with storage under the seats, all surrounding a pedestal table. The table has a foldout leaf and in the closed position the leaf support doubles as a handhold. The cleverness of this dinette area is in its ability to easily transition to a berth. Simply flip a lever under the curved stainless rail and press the table down. Flip open the leaf and slide the cushions to the center thereby completing the conversion… easy peasy.

Boston Whaler 315 Conquest

In this position you can see the U-shaped dinette with table and the collapsed position. Storage is under both side seats. The wood deck is standard.

Boston Whaler 315 Conquest

Here you can see the table expanded ready for dining for four people -- or cocktails for two.

Boston Whaler 315 Conquest

The entire area effortlessly converts to a berth.

Boston Whaler 315 Conquest

The head was large enough where I had no problem taking a mock shower inside. Notice the mirror on the inside of the door. There is an opening portlight, Corian counter, a pull-out shower wand, shower sump, sink, and a VacuFlush toilet with holding tank/Y valve/ pump out -- are all standard.


The MSRP price of the new 315 Conquest is $242,018 powered by twin Mercury 300-hp Verado engines. All you need is to add electronics. Equipped with most options that people might want including a bow thruster, A/C. generator, the cruising package, the port bench seat in the bulwarks, the summer kitchen, side and aft curtains brings the price up to about $282,117.


Overall I was very pleased with the job Boston Whaler did on the 315 Conquest. She's remarkably functional both above and below decks and a joy to operate. She comes standard with virtually everything you need to go out fishing or cruising, including 8 PFDs, flares, first aid kit and fire extinguisher.
If you are inclined to use the 315 for cruising, then you may want the cruising package which includes a hot water heater. The list of options above should more than cover what you might need to make this vessel one that you can take most anywhere in comfort.
The minimum power required for her is twin 250-hp outboards, so this option could lower the MSRP base price as well as give you greater range and perhaps better fuel economy.
In my opinion this is a wonderfully versatile boat that can be used as a retirement cruising boat for a couple, a distance cruising boat or a young family, or an economical blue water fishing boat for hard-core anglers. Because she is a hardtop express cruiser with an ample beam she should be both comfortable and safe offshore when things get snotty.