Marathon DN 1236 Jon 2012 boat specs
Marathon
Marathon DN 1236 Jon 2012
2012
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VS
Marathon Seneca Utility 12 2008 boat specs
Marathon
Marathon Seneca Utility 12 2008
2008
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Marathon DN 1236 Jon 2012 vs Marathon Seneca Utility 12 2008: Same Brand, Different Boat

The Marathon DN 1236 Jon 2012 is a flat-bottom design and the Marathon Seneca Utility 12 2008 is a modified-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.

On paper these two are close siblings in the size department - Marathon DN 1236 Jon 2012 at 12,0 ft versus Marathon Seneca Utility 12 2008 at 11,0 ft. At 110 lbs and 121 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.

Both boats share a closely matched power ceiling - 7 hp for the Marathon DN 1236 Jon 2012 and 10 hp for the Marathon Seneca Utility 12 2008. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.

Both boats are rated for 3 passengers - a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.

At this size, power-to-weight ratio matters more than outright horsepower. The Marathon Seneca Utility 12 2008 comes in at 12 lbs per hp versus 16 lbs per hp for the Marathon DN 1236 Jon 2012. The lower the ratio the more explosive the acceleration - meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.

Bottom line: The Marathon DN 1236 Jon 2012 and Marathon Seneca Utility 12 2008 are closely matched on the specs that matter most. Test-ride both on the water you actually use, check current dealer pricing, and factor in long-term service access before you sign.
General Boat Info
MakeMarathon
MakeMarathon
ModelDN 1236 Jon
ModelSeneca Utility 12
Model Year2012
Model Year2008
Measurements / Dimensions
Depth - Detail14 in.
Depth - Detail19 in.
Depth - Centimeters35.56
Depth - Centimeters48.26
Depth - Inches14
Depth - Inches19
Weight - Detail110 lbs.
Weight - Detail121 lbs.
Weight - kg49.9
Weight - kg54.88
Weight - lbs.110
Weight - lbs.121
Width [transom] - Detail53 in. 51 in. width at center seat
Width [transom] - Detailnot available
Height [transom]15 in.
Height [transom]15 in.
Length - Feet12
Length - Feet11
Length overall - Detail12 ft.
Length overall - Detail11 ft. 8 in.
Length overall - Meters3.66
Length overall - Meters3.56
Length overall - Inches144
Length overall - Inches140
Beamnot available
Beam55 in.
Beam - Metersnot available
Beam - Meters1.4
Beam - Inchesnot available
Beam - Inches55
Length - Inchesnot available
Length - Inches8
Body / Hull
Hull materialAluminum
Hull materialAluminum
Hull thickness0.050 in.
Hull thickness0.05 in.
Hull typeFlat
Hull typeModified Vee
Engine and Drivetrain
Fuel typeGas
Fuel typeGas
Drive typeOutboard
Drive typeOutboard
Engine max7 hp
Engine max10 hp
Operational Info
Maximum people3 / 506 lbs.
Maximum people3 / 350 lbs.
Maximum capacitynot available
Maximum capacity540 lbs.

Marathon DN 1236 Jon 2012 vs Marathon Seneca Utility 12 2008 - Common Questions

Which is the larger boat - the Marathon DN 1236 Jon 2012 or the Marathon Seneca Utility 12 2008?
The Marathon DN 1236 Jon 2012 is the longer of the two at 12,0 feet overall. The Marathon Seneca Utility 12 2008 comes in at 11,0 feet, making it roughly 1,0 ft shorter - a meaningful difference in deck room and overall on-water presence.
Which is easier to trailer - the Marathon DN 1236 Jon 2012 or the Marathon Seneca Utility 12 2008?
For trailering, the Marathon DN 1236 Jon 2012 has the edge at 110 lbs dry weight versus 121 lbs for the Marathon Seneca Utility 12 2008. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.
How many people can each boat hold?
The Marathon DN 1236 Jon 2012 is Coast Guard rated for 3 passengers, while the Marathon Seneca Utility 12 2008 is certified for 3. Note that legal capacity and comfortable capacity aren't always the same thing - on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.
Which boat has the better power-to-weight ratio?
The Marathon Seneca Utility 12 2008 has a better power-to-weight ratio at 12 lbs per hp compared to 16 lbs per hp for the Marathon DN 1236 Jon 2012. A lower number means quicker acceleration and faster time to plane - the number that actually matters most on short, sporty boats like these.
Are the Marathon DN 1236 Jon 2012 and Marathon Seneca Utility 12 2008 from the same manufacturer?
Yes - both the Marathon DN 1236 Jon 2012 and the Marathon Seneca Utility 12 2008 are built by Marathon. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.