Maritime collisions are complex incidents that often result in legal disputes over liability. One significant legal doctrine that applies in such cases is the Both-to-Blame Collision rule. This principle dictates that when two vessels share responsibility for a collision due to negligence, the liability is distributed accordingly. Understanding this rule is essential for shipowners, charterers, insurers, and cargo stakeholders to manage claims efficiently.
What is the Both-to-Blame Collision Rule?
The Both-to-Blame Collision rule is derived from international maritime law, including the Brussels Collision Convention of 1910. This rule establishes that when two vessels collide due to mutual negligence, damages are apportioned between them based on their level of fault. Cargo owners aboard either vessel cannot claim damages from the non-carrying vessel but must seek compensation from their own carrier, who can then recover part of the damages from the other vessel.
Explanation of the Both-to-Blame Collision Clause
The Both-to-Blame Collision Clause is commonly included in charter parties and bills of lading to regulate liability in such events. This clause specifically states that if both vessels involved in a collision are found at fault, the owners of the cargo aboard one vessel cannot claim compensation directly from the non-carrying vessel. Instead, they must seek reimbursement from their own carrier. The carrier, in turn, may recover a proportionate amount from the other vessel, depending on the degree of fault.
This clause effectively protects shipowners from direct claims by cargo interests, ensuring that liability is distributed as per the agreed contractual terms. It also helps in avoiding multiple overlapping claims, as the responsibility for compensating cargo losses falls initially on the vessel carrying the goods, rather than the vessel that caused the incident.

Real-World Example of a Both-to-Blame Collision
Imagine a scenario where:
- Vessel A is navigating through a congested sea lane at excessive speed with improper lookout.
- Vessel B makes an incorrect course alteration, leading to a direct collision with Vessel A.
- After investigation, Vessel A is found 60% at fault, and Vessel B is found 40% at fault.
- As a result, damages are shared based on this apportionment, and cargo owners must seek compensation from their carriers instead of directly from the opposing vessel.
Case Study: CMA CGM Florida vs. Chou Shan (2013)
A noteworthy Both-to-Blame Collision case involved the CMA CGM Florida and Chou Shan in 2013 in the East China Sea.
- Incident Overview: The CMA CGM Florida was on a steady course, while Chou Shan altered its path to avoid another vessel. Due to misjudgments in navigation, the vessels collided.
- Findings: Investigations revealed that both vessels contributed to the accident by failing to take adequate measures to avoid collision.
- Legal Outcome: Courts ruled shared responsibility, requiring damages to be split accordingly.
- Impact: Cargo owners were required to claim compensation from their respective carriers, triggering recovery claims under the Both-to-Blame Collision clause.
Maritime Legal Implications
- Charter Party Contracts: Many charter parties and bills of lading include a Both-to-Blame Collision Clause, ensuring that cargo interests recover losses through their own carrier.
- Marine Insurance & P&I Coverage: Protection & Indemnity (P&I) clubs play a crucial role in handling such claims, making comprehensive insurance essential for maritime stakeholders.
- Best Practices to Avoid Collisions: To mitigate risks, shipowners and operators should strictly adhere to COLREGs, maintain vigilant lookouts, and ensure robust bridge team communication.

Summary Table for Easy Understanding
ASPECT | EXPLANATION |
Defination | When two vessels share fault in a collision, liability is apportioned based on negligence. |
Legal Basis | Derived from the Brussels Collision Convention of 1910. |
Cargo Claims | Cargo owners must claim from their own carrier, not from the opposing vessel. |
Role of Clause | Protects shipowners from direct claims and ensures liability is distributed fairly. |
Compensation Process | The carrier compensates cargo owners and then seeks recovery from the other vessel. |
Common Inclusion | Found in charter parties and bill of lading. |
Insurance Implications | P&I clubs play a key role in covering liabilities under this rule. |
Conclusion
The Both-to-Blame Collision rule remains an essential principle in maritime law, shaping how liability is assigned in vessel collisions. Understanding and preparing for such scenarios can help stakeholders mitigate financial risks and ensure smooth maritime operations. By learning from past incidents and following best practices, the industry can enhance navigational safety and reduce legal complications.