Voyage Instructions in Ship Chartering: Time Charterers, Captain’s Orders and Bunker Planning

Voyage instructions are the practical operating directions sent to the captain (master) before and during a chartered voyage. They translate the commercial agreement in the charterparty into the day-to-day information required on board the ship. Proper voyage instructions help the captain (master), shipowner, charterer, manager, operator, port agent, and bunker supplier work from the same understanding of the employment.

Although the expression is often associated with a time charter, voyage instructions are also relevant in voyage chartering. The difference is mainly one of commercial control. Under a voyage charter, the shipowner usually retains greater control over the voyage and issues the necessary sailing and operational directions to the captain (master) in line with the fixture. Under a time charter, the charterer normally directs the commercial employment of the ship during the agreed period, subject always to the charterparty, lawful trading limits, safety requirements, and the shipowner’s rights.

For this reason, clear instructions are especially important under a time charter. The captain (master) must know who the charterers are, who is authorized to give orders on their behalf, and which manager, operator, broker, or agent may communicate voyage directions. Without this clarity, the ship may receive conflicting messages from several parties, creating a risk of delay, wrong routing, incorrect port nomination, bunker miscalculation, or breach of charterparty terms.

Purpose of Voyage Instructions

The main purpose of voyage instructions is to give the captain (master) the information needed to perform the voyage safely, contractually, and commercially. Instructions should not be treated as a casual message. They are a working document that may affect navigation, cargo operations, bunker planning, agency arrangements, laytime records, hire calculation, off-hire risk, port costs, and the ship’s compliance with local and international regulations.

Good voyage instructions normally identify the commercial background of the employment, the parties involved, the period or voyage covered, the intended trading area, the delivery and redelivery arrangements, the nominated ports, the cargo details, the reporting requirements, the bunker arrangements, and any restrictions imposed by the charterparty. The captain (master) should be able to read the instructions and understand exactly what the ship is expected to do, where the ship is allowed to trade, and whom the ship should contact at each stage.

Voyage Instructions Under a Time Charter

In a time charter, the charterer hires the ship for a stated period or trip and pays hire for the use of the ship. The shipowner remains responsible for the ship’s technical management, crew, maintenance, insurance, and seaworthiness, while the time charterer normally controls the commercial employment of the ship. This means the time charterer may give instructions about loading port, discharging port, cargo, route, speed, bunker supply, agents, and other commercial matters, provided the orders remain within the charterparty.

The captain (master) must be informed of the length of the period, the intended trade or trades, the permitted cargoes, and the geographical limits of the employment. The captain (master) should also know whether the charterparty excludes particular cargoes, ports, regions, canals, rivers, or political areas. Shipowners often prohibit dangerous cargoes, dirty cargoes, sanctioned trades, unsafe ports, war-risk areas, ice-risk areas, or other politically or geographically repugnant areas.

If the captain (master) receives an order that appears inconsistent with the charterparty, unsafe, unlawful, or outside the agreed trading range, the captain (master) should not simply proceed without clarification. The proper response is to notify the shipowner, manager, or operator immediately and ask for confirmation. This is why the captain (master) must understand the limits of the voyage instructions and must be able to react promptly if contrary orders are received from the time charterers or their representatives.

Delivery Information and Authorized Contacts

The most urgent information normally concerns the place, time, and arrangements agreed for the delivery of the ship to the Time Charterers. Delivery is the point at which the ship is placed at the charterer’s commercial disposal under the charterparty. From that moment, hire usually starts to run, subject to the exact wording of the contract.

The captain (master) should receive clear delivery instructions, including the delivery location, delivery window, estimated delivery time, bunker quantities on board, on-hire survey arrangements, and the name of the agents who will represent the shipowners at the time of delivery. If an on-hire survey is required, the captain (master) and chief engineer must be ready to record bunkers, draft, stores, condition of holds, condition of cranes, and any other relevant operational details.

The instructions should also state who is authorized to communicate with the ship after delivery. This may include the charterer’s operations department, the charterer’s nominated agents, the shipowner’s manager, protective agents, bunker suppliers, weather-routing service providers, and port captains. The captain (master) should avoid accepting important operational orders from an unidentified party or from a person whose authority has not been confirmed.

Permitted Cargoes and Trading Limits

Voyage instructions should reflect the cargo and trading limits agreed in the charterparty. If the ship is employed under a dry bulk time charter, the instructions should clarify the intended cargoes and whether the ship may carry minerals, grains, fertilizers, steels, logs, concentrates, cement, coal, petcoke, or other bulk commodities. If certain cargoes are excluded, this should be made clear to the captain (master) before the ship is ordered to a loading port.

Cargo restrictions are not merely commercial preferences. They may affect safety, hold cleanliness, cargo claims, insurance, class requirements, port acceptance, and future employment. A cargo that is lawful and common in one trade may still be unsuitable for a particular ship because of hold condition, previous cargo history, crane capacity, hatch dimensions, ventilation arrangements, cargo residues, or contamination risk.

Geographical restrictions are equally important. The charterparty may limit employment to safe ports, safe berths, good and safe anchorages, ice-free areas, International Navigating Limits, or named trading regions. The captain (master) must understand these limits so that the ship is not ordered into a prohibited or unsafe area without the shipowner’s consent.

Bunker Planning and Fuel Instructions

Bunker planning is one of the most important parts of voyage instructions. Today, most ocean-going bulk carriers use Intermediate Fuel Oil (IFO), Very Low Sulphur Fuel Oil, or other compliant fuel grades for main-engine operation at sea, depending on the ship’s machinery and regulatory requirements. Auxiliary engines may operate on Intermediate Fuel Oil (IFO), Marine Diesel Oil (MDO), Marine Gas Oil, or another approved fuel grade according to the ship’s design and the applicable fuel regulations.

In older machinery, Marine Diesel Oil (MDO) may be required for starting, warm-up, low-load operation, or manoeuvering, because the main engine may not respond efficiently to rapid speed changes when burning heavier fuel. The captain (master) and chief engineer must therefore understand what fuel is available on board, what fuel the ship is permitted to burn, and what fuel will be required for each stage of the voyage.

Many ships use Intermediate Fuel Oil (IFO) or other residual fuel grades because they are usually cheaper than Marine Diesel Oil (MDO). However, price is only one factor. Bunker quality, sulphur content, port availability, emission-control requirements, engine compatibility, tank segregation, heating requirements, and fuel-changeover procedures must also be considered. A poorly planned bunker stem can create operational delay, machinery risk, off-hire arguments, or disputes over speed and consumption.

When the ship is in port, the main engine is normally shut down, but auxiliary engines may continue running to supply electricity for lighting, pumps, accommodation, deck machinery, and cargo equipment. If the ship uses on-board cranes or grabs during loading or discharging, auxiliary-engine consumption may increase significantly. This is particularly important in geared bulk carrier employment, where cargo operations may require substantial electrical power.

For this reason, the captain (master) needs voyage instructions in advance. Without timely information about port rotation, expected waiting time, cargo gear use, bunker supply, and sailing route, the ship cannot prepare a reliable consumption estimate or voyage plan. Late instructions may also make it difficult to arrange bunkers at the most economical or operationally suitable port.

Information That Should Be Included in Voyage Instructions

Professional voyage instructions should be concise, but they should not omit essential information. Depending on the fixture, they may include the following items:

Full name and contact details of the charterer.
Name of the manager, operator, broker, or agent authorized to issue instructions.
Charterparty date, charterparty form, and relevant recap details.
Delivery place, delivery time, and on-hire survey arrangements.
Length of the charter period or trip description.
Permitted trade, cargo, port, and geographical limits.
Loading port, discharging port, berth, anchorage, or port range.
Cargo description, quantity, stowage factor, special handling needs, and hold-cleaning requirements.
Bunker quantities on delivery and bunker supply arrangements.
Speed and consumption instructions, including any economical speed requirements.
Routeing instructions, weather-routing requirements, and canal or strait transit plans.
Agency appointments and protective-agency arrangements.
Reporting requirements, including noon reports, arrival notices, departure notices, and bunker reports.
Instructions for notices of readiness, statements of facts, cargo documents, bills of lading, and port papers.
Any special insurance, security, war-risk, piracy, sanctions, or environmental requirements.
Redelivery range, redelivery notices, and minimum bunker quantities on redelivery.

Operational Reports and Communication Discipline

Voyage instructions should also establish a reporting routine. In many time charter employments, the captain (master) is expected to send daily noon reports showing position, course, speed, weather, distance steamed, fuel consumed, fuel remaining on board, estimated time of arrival, and any operational remarks. Additional reports may be required on arrival at port, tendering notice of readiness, berthing, commencement of loading or discharging, completion of cargo operations, sailing, bunkering, and redelivery.

Accurate reporting protects both the shipowner and the charterer. It provides a record for performance analysis, bunker reconciliation, off-hire discussions, laytime support, agency coordination, and operational planning. Inaccurate or incomplete reports can later lead to disputes over underperformance, weather delays, port waiting time, bunker consumption, or whether the ship followed the charterer’s lawful instructions.

The captain (master) should keep a professional communication trail. Important instructions should be in writing, and any verbal order that affects the voyage should be confirmed by email or other written message. This is especially important where the instruction concerns deviation, slow steaming, change of port, change of route, bunker stem, cargo documents, bills of lading, or safety-related matters.

Contrary Orders and the Captain (Master)’s Position

A time charterer has broad commercial control, but that control is not unlimited. The charterer cannot lawfully require the ship to proceed to an unsafe port, carry a prohibited cargo, breach sanctions, violate flag-state requirements, ignore class restrictions, disregard local law, or operate in a way that endangers the ship, crew, cargo, or marine environment. The captain (master) remains responsible for navigation and safety.

If the captain (master) receives an order that conflicts with the charterparty or with safe operation, the captain (master) should promptly advise the shipowner or manager. The captain (master) should explain the concern clearly and request further instructions. The issue may be resolved by clarification, by a revised order, by the shipowner’s consent, by additional insurance arrangements, or by formal protest if necessary.

This is one of the main reasons why voyage instructions must be precise. The captain (master) should know from the beginning whether the ship may load the nominated cargo, whether the port is within the permitted trading area, whether extra war-risk premium applies, whether special clauses are triggered, and whether the instruction requires shipowner approval.

Voyage Instructions and Charterparty Performance

Voyage instructions can have a direct effect on charterparty performance. In a time charter, wrong or late instructions may waste time while hire continues to run, or may create disputes if the ship cannot comply for reasons connected with safety, legality, or charterparty restrictions. In a voyage charter, unclear operational instructions may affect arrival, tendering of notice of readiness, laytime calculation, cargo documentation, and demurrage exposure.

The shipowner, charterer, and broker should therefore treat voyage instructions as part of the practical execution of the fixture. They should be consistent with the charterparty and should not attempt to change the contract informally unless both parties clearly agree. If a new instruction changes the agreed voyage, trading area, cargo, costs, or risk allocation, the parties should record the amendment properly.

Clear instructions also reduce the risk of unnecessary disagreement with port agents. Agents need to know who appointed them, whose interests they represent, what documents must be prepared, which party pays which port costs, and who should receive operational updates. When agency authority is unclear, cargo operations and documentation may be delayed.

Practical Importance of Early Voyage Instructions

Early voyage instructions allow the captain (master) and ship’s officers to prepare the ship properly. The chief officer may need to plan hold cleaning, cargo readiness, ballast condition, stability, hatch preparation, gear inspection, and loading sequence. The chief engineer may need to plan fuel changeover, bunker transfer, auxiliary-engine use, maintenance timing, and expected consumption. The captain (master) may need to plan the route, check navigation warnings, review port regulations, and coordinate with agents.

If instructions arrive late, the ship may lose valuable time. Bunkers may not be stemmed at the best port. Holds may not be ready for inspection. Weather routing may be incomplete. Notices may not be sent on time. Agents may not have correct information. These operational failures can later become commercial disputes, especially where hire, off-hire, laytime, demurrage, or performance claims are involved.

In professional chartering practice, voyage instructions are therefore more than administrative correspondence. They are an operational bridge between the charterparty and the voyage. They help ensure that the ship trades within the agreed limits, uses bunkers efficiently, communicates with the correct parties, follows lawful commercial orders, and remains ready for safe and efficient performance.

Conclusion

Voyage instructions are essential in both voyage charter and time charter operations, but they are particularly important when time charterers direct the commercial employment of the ship. The captain (master) must know the charterer’s identity, the authorized contacts, the delivery arrangements, the permitted trade, the cargo restrictions, the bunker position, the reporting duties, and the limits of the charterer’s authority.

Well-prepared voyage instructions reduce confusion, support safe navigation, improve bunker planning, protect the shipowner’s contractual position, and help the charterer obtain efficient commercial performance from the ship. Poorly prepared or delayed instructions can cause practical problems that quickly turn into expensive disputes. For that reason, every voyage instruction should be clear, timely, complete, and consistent with the charterparty.