Marathon Jon - DN 1236 2007 boat specs
Marathon
Marathon Jon - DN 1236 2007
2007
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VS
Marathon Seneca 12 2011 boat specs
Marathon
Marathon Seneca 12 2011
2011
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Marathon Jon - DN 1236 2007 vs Marathon Seneca 12 2011: Same Brand, Different Boat

The Marathon Jon - DN 1236 2007 vs Marathon Seneca 12 2011 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.

On paper these two are close siblings in the size department - Marathon Jon - DN 1236 2007 at 12,0 ft versus Marathon Seneca 12 2011 at 11,7 ft. At 124 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 Jon - DN 1236 2007 and 10 hp for the Marathon Seneca 12 2011. 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 12 2011 comes in at 12 lbs per hp versus 18 lbs per hp for the Marathon Jon - DN 1236 2007. 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 Jon - DN 1236 2007 and Marathon Seneca 12 2011 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
ModelJon - DN 1236
ModelSeneca 12
Model Year2007
Model Year2011
Measurements / Dimensions
Beam51 in.
Beam55 in.
Beam - Meters1.3
Beam - Meters1.4
Beam - Inches51
Beam - Inches55
Depth - DetailAmidship: 14 in.
Depth - Detail19 in.
Depth - Centimeters35.56
Depth - Centimeters48.26
Depth - Inches14
Depth - Inches19
Weight - Detail124 lbs.
Weight - Detail121 lbs.
Weight - kg56.25
Weight - kg54.88
Weight - lbs.124
Weight - lbs.121
Width [transom] - Detail53 in. Bottom Width: 36 in.
Width [transom] - Detailnot available
Length - Feet12
Length - Feet11.67
Length overall - Detail12 ft. 0 in.
Length overall - Detail11 ft. 8 in.
Length overall - Meters3.66
Length overall - Meters3.56
Length overall - Inches144
Length overall - Inches140
Height [transom]not available
Height [transom]15 in.
Body / Hull
Hull thickness.063 in.
Hull thickness0.050 in.
Hull materialnot available
Hull materialAluminum
Hull typenot available
Hull typeModified Vee
Engine and Drivetrain
Fuel typeGas
Fuel typeGas
Drive typeOutboard
Drive typeOutboard
Engine max7 hp
Engine max10 hp
Operational Info
Maximum capacity506 lbs.
Maximum capacity540 lbs.
Maximum people3
Maximum people3 / 350 lbs.

Marathon Jon - DN 1236 2007 vs Marathon Seneca 12 2011 - Common Questions

Which is the larger boat - the Marathon Jon - DN 1236 2007 or the Marathon Seneca 12 2011?
The Marathon Jon - DN 1236 2007 is the longer of the two at 12,0 feet overall. The Marathon Seneca 12 2011 comes in at 11,7 feet, making it roughly 0,3 ft shorter - a meaningful difference in deck room and overall on-water presence.
Which is easier to trailer - the Marathon Jon - DN 1236 2007 or the Marathon Seneca 12 2011?
For trailering, the Marathon Seneca 12 2011 has the edge at 121 lbs dry weight versus 124 lbs for the Marathon Jon - DN 1236 2007. 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 Jon - DN 1236 2007 is Coast Guard rated for 3 passengers, while the Marathon Seneca 12 2011 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 12 2011 has a better power-to-weight ratio at 12 lbs per hp compared to 18 lbs per hp for the Marathon Jon - DN 1236 2007. A lower number means quicker acceleration and faster time to plane - the number that actually matters most on short, sporty boats like these.
Which boat is wider, and does it affect trailering?
The Marathon Seneca 12 2011 measures 55" wide, compared to 51" for the Marathon Jon - DN 1236 2007. The US standard-width towing limit is 8’6" (102") in most states - anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.
Are the Marathon Jon - DN 1236 2007 and Marathon Seneca 12 2011 from the same manufacturer?
Yes - both the Marathon Jon - DN 1236 2007 and the Marathon Seneca 12 2011 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.