USIBA (IMO 9755268) Table Bay, Cape Town
USIBA Tug (IMO 9755268): Purpose and Harbour Duties
Explore USIBA (IMO 9755268), a South African harbour tug, its technical specifications, vessel-assistance duties and role in port operations. |
| USIBA (IMO 9755268) Table Bay, Cape Town |
Photographer's Note: USIBA (IMO 9755268) was photographed by Vernon Chalmers in Table Bay, Cape Town. The image forms part of the Vernon Chalmers Photography Maritime Studies Project and is also published in the Shipspotting.com database.
Purpose and Duties of a South African Harbour Tug
In maritime photography, a vessel's appearance is only the starting point of its story. Understanding its operational purpose provides a deeper appreciation of its contribution to port activities, maritime safety and commercial shipping.USIBA (IMO 9755268) is a South African harbour tug built in 2017 by Southern African Shipyards in Durban. Published vessel particulars list an overall length of approximately 32 metres, a beam of 11.5 metres and a bollard pull of 70 tonnes. The vessel is associated with Transnet and operates under the South African flag.
Unlike a container ship, bulk carrier or tanker, USIBA does not primarily transport commercial cargo between ports. Its purpose is to provide specialised assistance to larger vessels navigating port approaches, turning basins, berths and other restricted waterways.
This distinction makes USIBA a valuable subject for the Maritime Observation System (MOS): it represents the operational infrastructure that enables commercial shipping to function efficiently.
USIBA (IMO 9755268) Vessel Specifications
- Type: Tug / Harbour Craft
- IMO Number: 9755268
- MMSI: 601366500
- Call Sign: ZS2525
- Flag: South Africa
- Year Built: 2017
- Builder: Southern African Shipyards (SAS), Durban
- Length Overall (LOA): ~30 to 32 meters
- Beam (Width): ~12 meters
- Gross Tonnage (GT): 480 GT
- Deadweight (DWT): 260 DWT
USIBA (IMO 9755268) Operational History
- Contract: Built as the seventh vessel in TNPA’s R1.4 billion, nine-tug construction contract.
- Naming: Christened Usiba (derived from the isiZulu word for feather) by Lady Sponsor Judith Nzimande.
- Home Port: Assigned to the Port of Cape Town to assist larger commercial vessels and improve marine efficiency and turnaround times.
USIBA's Primary Duties: Harbour Towage and Vessel Assistance
The operational role of a tug such as USIBA is best understood through the manoeuvring challenges faced by much larger ships. A deep-sea vessel may have powerful engines and sophisticated navigation equipment, but its size, momentum, windage and limited manoeuvrability can make precise movements inside a harbour difficult.
USIBA provides additional, externally applied force under the direction of the relevant maritime personnel. Tug assistance forms part of the marine services that support commercial shipping in South African ports.
1. Assisting vessels during arrival and berthing
One of the principal duties of a harbour tug is assisting arriving ships as they approach their assigned berths. A tug can push against a vessel's hull or pull through a towline to help control its position and movement.
This assistance is particularly valuable when a large vessel needs to move laterally towards a quay, correct its alignment or counter unwanted movement caused by wind and currents.
The tug operates as part of a coordinated manoeuvre rather than independently directing the commercial ship. The number of tugs required and their positioning depend on the vessel, prevailing conditions and port requirements.
2. Supporting departure and unberthing
When a ship leaves its berth, a tug may help move it clear of the quay, turn it towards the required heading or control its movement until it has sufficient room to manoeuvre safely.
A vessel's departure is not simply the reverse of its arrival. Available space, wind direction, current, vessel configuration and port traffic can all influence the operation.
USIBA's role is therefore one of controlled assistance, helping larger vessels complete movements that require precision in restricted waters.
3. Turning and repositioning vessels
Turning a large vessel within a confined port can require carefully coordinated forces from more than one tug. A tug can apply lateral force at a suitable point on the ship to help rotate its bow or stern.
This is particularly relevant when a vessel must align with an exit channel or change direction within a turning basin.
For MOS purposes, these manoeuvres illustrate an important operational distinction: a tug's effectiveness is not determined simply by its size relative to the vessel it assists, but by its ability to apply controlled force at the right location and at the right time.
4. Emergency assistance and maritime safety
Tug duties can extend beyond routine berthing and departure operations. Depending on its equipment, availability, operating instructions and the circumstances, a tug may assist a vessel experiencing propulsion difficulties or an unsafe movement within port limits.
However, not every tug is equipped or assigned for every salvage or emergency operation. The distinction between routine harbour towage, emergency assistance and specialist salvage work is important when documenting a vessel's operational capabilities.
USIBA's published bollard pull of approximately 70 tonnes indicates its rated static pulling capability under specified test conditions. This provides a useful measure of towing force, but it does not independently establish the tug's suitability for every emergency or determine the force it can exert under all operating conditions.
Technical Characteristics and Operational Context
USIBA's published dimensions and bollard pull help explain its intended working environment. Its compact overall length and substantial beam are consistent with the practical demands of harbour operations, where manoeuvrability and the ability to work close to larger vessels are important.
The bollard pull figure is particularly relevant. It describes the static pulling force a tug can exert under specified conditions and is an important consideration in assessing tug capability. Actual performance depends on factors including propulsion configuration, operating conditions and the manoeuvre being performed.
The vessel's construction by Southern African Shipyards in Durban also provides a South African industrial context for the MOS record. Shipbuilding, marine services and port operations form interconnected parts of the country's maritime infrastructure.
Nevertheless, published specifications should be distinguished from direct operational observations. A vessel's dimensions and rated pulling force can be documented from technical references, while its actual duties on a particular day require confirmation from observation or authoritative operational records.
Maritime Observation System
USIBA Within the Maritime Observation System
The MOS approach extends beyond recording a vessel's name, IMO number and physical characteristics. It connects visual observation with research into the vessel's purpose, operational context and place within the wider maritime environment.
USIBA provides a useful example of this approach.
OBSERVE: Identify the tug's position, orientation, visible equipment and relationship to nearby vessels.
PHOTOGRAPH: Record the vessel's profile, wheelhouse, working deck, hull markings and any observable tug-assistance activity.
IDENTIFY: Confirm its name and IMO number against published vessel particulars.
INVESTIGATE: Establish its classification, construction background, dimensions, operator information and intended operational role.
DOCUMENT: Explain how harbour towage contributes to berthing, unberthing, turning and, where applicable, emergency assistance.
ARCHIVE: Add the vessel to the Table Bay Vessel Register and link the photographic record to its MOS essay.
INTERPRET: Place the tug within the wider system of port operations, where marine services support the safe and efficient movement of commercial shipping.
This process transforms a photograph into a documented maritime observation. The resulting record explains not only what the photographer saw, but also why the vessel exists and how its function relates to the maritime environment.
Table Bay Maritime Environment Through Photography
Conclusion: A Small Vessel With an Essential Function
USIBA illustrates why harbour tugs deserve a place in a systematic maritime photographic archive. Although modest in size compared with the container ships, bulk carriers and tankers they assist, tugs perform specialised duties that support the daily operation of commercial ports.
Their work combines power, manoeuvrability, timing and coordination with pilots and other port personnel. The result is a practical contribution to safe vessel movements in environments where large ships have limited room to manoeuvre.
For the Maritime Observation System, USIBA is more than another South African vessel entry. It is an opportunity to document the supporting infrastructure of maritime commerce and explain the operational duties behind what might otherwise appear to be an ordinary harbour tug.
The Table Bay, Cape Town Lighthouse Triangle
Photographic Equipment
Cameras: Canon EOS R6 Mark III
Lenses: Canon RF 800mm f/11 IS STM
Photographic Genre: Maritime Photography / Ship Spotting
Post Processing: Adobe Lightroom Classic Version 15
Lighthouse Reference Points
Maritime Location: Table Bay, Cape Town, South Africa
