Yes, with care.
They work well aboard on hard surfaces such as hull and rigging. They are great for washing the dirt out dirty dock lines, sheets and halyards. It will remove a lot of the oxidation from faded gelcoat and vinyls. 1200-1400 psi is plenty big enough and yet small enough to minimize risk of damage...lighter too. Keep away from wood and fabric as even the lower pressures can do considerable damage.
