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Boat Specification

Cape Town’s challenging South Atlantic currents and inhospitable seas have long been famed as a testing location for seafarers.

With thirty years of experience in designing engineering and building Rigid Hull Inflatable Boats, Gemini have become a byword for dependability and capability. Being the builder of choice for international commercial operators, Special Forces, Police and rescue institutions worldwide; these boats have been tested to the limit.

The Gemini Waverider 550 is therefore the option of choice for South Africa’s National Sea Rescue fleet as a mid-range hull with a variety of engine, console and seating options to allow you to tailor the 550 to your needs.

If you value professional-level fit-out and performance, the 550 will deliver.

The rugged GEMINI Waverider 550 was designed to withstand the harshest of weather conditions.

These mid-sized models in the Gemini range of RIBS are not only used commercially, but also for rescue & military operations internationally, with the majority of the National Sea Rescue institute’s fleet is made up of GEMINI WR 550’s.

The WR 550 is offered with a large choice of engines, consoles, seating and on-board equipment and is also available with T-top to protection crew and passengers from the elements.


  • Hull Quality – Constructed from advanced composite materials; providing an exceptionally strong structure, and a damage and corrosion resistant craft.
  • Superior Seakeeping – Gemini’s composite deep vee hull offering outstanding seakeeping, improved stability, as well as being forgiving to operate.
  • Interoperability – Available with single or multipoint lifts designed for safe launch and recovery.
  • Proven – A hull design for superior seakeeping, payload carrying and reduced hull slamming supported by advanced shock mitigation seating ensures personnel remain fully capable throughout mission.
  • Reliable – Outboard engine options delivers improved reliability, superior shallow water capability (o/b) and exceptional maneuverability and control at low and high speed.
  • Mission Specific – Flexible platform design which can be adapted differing configuration, bespoke fit out and equipment fit.
  • Self-Righting – Designed to incorporate self-righting system
  • Compliance – Built to international recognised standard, and can be easily equipped and coded to meet local authority regulatory compliance.
  • Transportability – The WR650 is transportable by road on road trailer or flatbed truck, it can also fit in an ISO shipping container and can be made compatible for air transport.

Performance Data:

Approximate performance data with differing engine horse powers and configurations are available on request.

  • Engine Options – Single or Twin Install
  • Petrol Outboards: Mercury, Mariner, Suzuki, Evinrude, Yamaha.
  • Inclusive of a choice of steering and fuel systems.


There are a number of differing configurations available, and general arrangement drawings are available on request. In addition custom configurations are available according to weight and balance.

Standard Equipment:

  • Hypalon sponsons (1100Dtex)
  • 2 x Heavy duty shark fin rubbing strakes
  • Full length grab line
  • 5 x Inflation Valves
  • 5 x Over pressure release valves
  • Internally taped seams
  • 2 x Paddles
  • Stainless steel bow eye
  • Anchor rope bow protection
  • Anchor locker
  • Aluminium keel protection
  • Transom knee

Optional Equipment:

Deck Equipment:

  • Choice of Consoles Configurations
  • Choice of Jockey or Shock Mitigation Suspension seats
  • Lifting eyes & Lifting Strops
  • Extra fuel tanks (up to 1080 l.)
  • Foam filled hull
  • M8 deck utility bolt system
  • Deck track system
  • Strengthened deck for high load areas and mounts
  • T-top
  • Towing bollard

A Frame Options

  • Choice of A-Frame Configuration & Material
  • Self-Righting system on A-Frame


  • Additional fenders on sponsons (1 or 2 extra)
  • Colour strip between bumpers
  • Additional rubbing strips on the front for bow protection
  • Anti-slip surfaces on sponsons
  • Upgrade to DTEX 1670

Navigation & Communication System Options:

  • VHF Radio (Fixed & Handheld)
  • GPS Chartplotter
  • Radar
  • AIS
  • Depth sounder
  • Intercom
  • Entertainment system
  • Command and Control systems
  • Bespoke system integration and system fit available on request

Specialist Equipment Fit

Specialist and client supplied equipment fit and integration is available on request at Berthon Boat Company.


Consumable and Contingency spares packages are available on request


The following training courses are available:

  • Operator Training
  • Mechanic Training
  • Specialist Equipment Training
  • Specialist Role Training

RIB Dimensions

  1. LOA: 5.05m
  2. Internal Length: 3.20m
  3. Beam Overall: 2.20m
  4. Internal Beam Overall: 1.18m
  5. Weight (hull, deck & tubes): 260kg
  6. Recommended Max Pax: 7
  7. Max Load: 975kg

Engine Options

  • Petrol Outboards: Mercury, Mariner, Suzuki, Evinrude, Yamaha.
Additional power available subject To manoeuvring & speed testing
  1. ISO Recommended HP: 90
  2. ISO Max HP: 100
  3. ISO Max Engine Weight: 180kg
  4. Max Fuel Capacity: 75L
  5. Transom Height (single): 20"
  6. Transom Height (double): 20"

Tubes, Hull & Deck

  1. Tube Diameter: 460mm
  2. Tube Volume: 1.709m3
  3. Inflation Pressure: 0.25 bar
  4. Tube Compartments: 5
  5. Hull Deadrise: 24°
  6. Max Displacement: 1210kg

Contact Details

Ben Bradley-Watson, Commercial & Defence Business Development Manager 2, Berthon Brokerage

Ben Bradley-Watson
Berthon Shipyard
Tel: 01590647416

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