For marine use the little portable fire pumps are a solid option.
One ,is what it is , two can help make a difference, three can be a game changer and more can really get the job done.
This pick of me and my fire pump set up and ready to go. I was lonely being the only guy on the dock
Fire pump and all.
Job one for me is to set up a fire break by moving boats away from the fire. Unless the fire is still small and can be contained.
Smoke is the issue much more than the actual fire in my experience. You just do not play in or around the toxic stuff wafting around a boat on fire. Keeping mobile is a must.