Which of the following is NOT a type of patch found onboard?

The correct answer identifies a type of patch that is not typically found onboard. A seal patch is not a recognized category among the commonly used patches in maritime applications.

In contrast, soft patches, jubilee patches, and hinge patches are all established types of patches used for different purposes in managing leaks or securing connections aboard a vessel.

A soft patch is generally used to temporarily seal a leak and can be made from flexible materials that conform to the shape of the damaged area. A jubilee patch consists of a clamping mechanism and is used to secure leaking pipes effectively. Hinge patches, while less common, are utilized for joining or securing components that need to pivot or function in tandem.

Overall, understanding the types of patches and their uses is essential for effective maintenance and safety operations onboard, making the distinction between these materials crucial.