Which document must be carried aboard while operating a vessel?

When operating a vessel, the registration certificate is a critical document that proves the ownership and legal registration of the boat with the relevant authorities. This document ensures that the vessel meets all the safety and regulatory standards established by the governing body and is recognized as a legitimate watercraft. It is an essential factor for accountability and compliance; without it, an operator may face penalties or legal issues if stopped by law enforcement or during inspections.

In contrast, while a fishing license may be necessary for recreational fishing, it is not required for the general operation of a vessel unless fishing is taking place. An insurance policy, although important for financial protection, is not mandated to be on board; however, it's advisable to maintain coverage for liability and damage. A training manual may serve as a useful reference for operations or safety, but it does not serve the legal purpose that a registration certificate does. Thus, possessing the registration certificate while operating a vessel aligns with legal requirements and operational standards.