In the US "wilderness" gets defined as time to hospital greater than 1 hour. Even coastal cruisers will meet this definition. So wilderness first aid (a basic course that really serves to teach the proper mindset to make first aid decisions outside an urban area), wilderness medicine (geared to practicing medical professionals), and wilderness first responder (sort of an EMT course for the backcountry) are all appropriate options. None of the courses will make a casual participant into a skilled provider, but they are a good second step after a participatory first aid course. The WFA is really geared to two areas- treatment of common injuries and decisions for evacuation. Best for the coastal cruiser. The WFR course is probably better for open
water cruisers.
I'm hoping to get the teaching authorities to add a variant of these courses that would serve the
boating community specifically.