On a larger vessel where the kitchen may have a chip pan or other deep fat fryer, then the use of wet chemical or foam extinguishers with a special additive to tackle Class F fires is a must. A fire blanket should also always be used in any kitchen area. They are easy to use, simple to deploy and extremely cheap to purchase.
To see if an extinguisher is marine approved simply look for the white ships wheel printed onto the cylinder of the fire extinguisher. These models are identical to land based extinguishers but normally have a special coating so as to not corrode in salty environments.
Jump overboard? Not the most inviting of prospects as the sea can be a harsh and unforgiving force. In all reality, the boat may very well have been totally consumed by flames before fire fighters can arrive to tackle the blaze.
