Which of the following can be used for chaffing on a vessel?

Chaffing gear is essential for protecting lines and cables on a vessel from wear and abrasion, particularly where they rub against rough edges or surfaces. Using a fire hose or heavy-duty material like #1 canvas is effective because these materials provide a robust barrier against friction and abrasion. They can be wrapped around vulnerable sections of rope or cable to extend their lifespan and prevent damage.

In contrast, a rope or chain lacks the protective properties needed for chaffing and may lead to further abrasion without adequate coverage. A life jacket and flotation devices, while critical for safety in emergency situations, do not offer the necessary structural integrity to mitigate chaffing, as they are designed for buoyancy rather than abrasion resistance. Thus, the use of fire hoses or canvas represents the most appropriate choice for chaffing on board a vessel.