MODCAT Catamarans and Barges are constructed by our Legacy Marine yard, based in Port Elizabeth, South Africa.

Legacy Marine, since 2004, specialises in the design and construction of innovative and high-quality aluminium Marine Solutions.

MODCAT sales and distribution are managed from our headquarters in South Africa who also make available our T-Craft, Legacy Cat and original design vessels.

MODCAT has service and distribution partners based in South Africa, Mozambique, Zambia, Nigeria, Namibia, Kenya, Malawi, Australia and North America.

Feel free to contact us to find a cost effective solution anywhere on the Globe.

Press Release: 

We are honored to be associated with Legacy Marine Group and our sister company, LegacyCats, and congratulate all involved on the successful launch of their Dive Support Vessel.

 modcat environmental








Our Modcat SML 1200 SD Cargo platform, is a standard build concluded for the following application profile, which is based on an actual build. It is not regarded as exhaustive, and is provided as a means of providing prospective clients with a practical case study to work from.  



We were approached by a marine Spill response client to design and construct an open deck vessel with Maximum deck space for environmental, civil, salvage, dive support and OPL work in the Port Elizabeth harbour and bay area. He operated a small fleet and already owned a Modact 600.

After engaging with the client, and understanding his specific needs regarding his workboat functional requirements, we were confident that he could meet the obligations of his new contract by utilizing a Modcat as well as secure a satisfactory return on his investment. Due to the nature of his business, he required the vessel to be in knock down form for ease of transport to alternative work sites.

Essential requirements called for a 6 ton Hydraulic crane. The deck had to have a removable hatch over a mishap moon pool. Night operations called for the required electronic navigation equipment plus adequate deck and internal lighting, removable cargo and safety rails to be supplied. Rugged bollards and fender securing cleats to be fitted to the sides and bow of the vessel. Lifting lugs to be welded to the hull for vessel cranage.

As the vessel would be required to operate off-shore in weather conditions of up to Sea State 3, a Bow Deflector was to be fitted to protect the cargo and crew from sea spray.

Registration requirements were to be for SAMSA Category B vessels with a crew complement of 10, plus a 5 ton deck cargo payload.




We were able to use an existing SML 1200 SD which was in the budget range proposed and provide the following solution to our client.

The design selected was built directly off existing engineering drawings and was constructed within 2 months.

  • Modcat Propulsion Selected: 2 x 115 HP Four Stroke Evinrude engines

The client procured and fitted his own twin motors installation with dual hydraulic steering.

  • 2 x 115 HP Evinrude engines were Initially fitted when the vessel used for salvage and ship repair operations.
  • However as the demand grew for offshore OPL works, the vessel was repowered with 2 x 175 HP 4-stroke Suzuki Engines for servicing passing ships.




  • 56 square meters of open deck space with multiple built in tie-down and hardpoints.
  • Reinforced deck with internal supports welded in place for the hydraulic crane mounting.
  • Fully welded aluminium cabin with a lockable door, front opening window, console housing the GPS / Echo sounder, VHF radio, motor gauges, DC switch boards compass and bilge watch switches.
  • Moon pool located midships with locking latches for the handling of mooring blocks and ROV operations.
  • Removable Safety and Cargo railings that drop into receiving slots and are held in place with latching hooks.
  • HD Aluminium lifting lugs welded into the hull for a lifting the vessel.
  • Bolt on bow splash deflector with lockable anchor hatches, crew seating.
  • Lugs welded to the hull sides for lashing on side fendering



  • PALFINGER hydraulic Crane
  • On-board Diesel powered hydraulic power pack fitted with quick couplers connecting the HPU to the crane for ease of disassembly when relocating the vessel. The crane controller was a remote unite allowing the operator the mobility to be able operate the crane from anywhere with in 20 m of the crane.



  • After sea trials an average range of 2.4 litre of fuel per NM running light ships at 12 Knots was established.



  • The vessel was issued with a full set of safety equipmen trequired for 10 crew operating less than 40 nm off-shore.
  • The vessel was required to comply with SAMSA - Category B Safety Rules.




  • The entire vessel was signed off at our works and then loaded onto an Abnormal Load Bed truck and transported to the Port Elizabeth harbour for sea trials and commissioning.
  • This vessel was subsequently disassembled and transported to Cape Town for project work and returned to its home-port a week later by the client using their own 12m truck fitted with a 8,5 ton knuckle crane.
  • The vessel disassembly and reassembly operations were each accomplished in one day.




  • Offloading and assembly was assisted by the use of the 8-ton crane truck.
  • The launch from the quay side to the water was done by a 45-ton mobile crane which was available on site.




  • Assembly by 2 Legacy Marine Technicians and 2 local labourers took 1 day from start to sea-trials




  • Commissioning and crew orientation took place in Port Elizabeth Harbour
  • Instrument calibration, Range and Performance was further tested by running from Port Elizabeth harbour in South Africa to and from Cape Recife.




  • Vessel performance with the 175 hp motors - sea state 4, wind speeds 11- 16 Knots
  • Running light ship at 4000rpm burning 23 l/h per motor @ 18 Knots
  • Running light ships 2500rpm burning 12 l/hr per motor @ 12 Knots
  • Running with 10-ton Deck cargo at 4500rpm 31 l/h per motor @11 Knots
  • Stability tested by SAMSA and the vessel is capable of carrying a 10-ton deck cargo.




  • The actual freight Costs to site were minimal and On-Site Contractor Costs were greatly reduced requiring only 1 day.
  • Vessel fuel efficiency and sprint speeds exceeded all expectations.
  • The vessels versatility and immediate availability made the platform perform far better commercially than originally expected.
  • The vessel safely provided a better Payload than anticipated, thus creating a higher income yield per trip. 


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