Lightning protection for you boat

[GordMay]

NFPA 780: Standard for the Installation of Lightning Protection Systems
➥ http://www.jerrypeck.com/IFCN/2016-0...%20Systems.pdf

See Chapter 8 Protection for Watercraft

Per 8.2.3.1
Copper cable conductors shall be of a diameter not less than 4 AWG for the main down conductor, not less than 6 AWG for two parallel paths, or 8 AWG for more than two paths (such as those to shrouds and stay connections on sailboats).

[Pegu Club]

So far nothing can prevent a lighting strike. If there was a system that could do so everyone of us would have purchase it already, and some company or another would be making a lot of money off of the technology (and not just in the boating industry) but that is not the case.
One can mitagate to some degree the effects of being hit by lighting via bonding / grounding on a boat, but it would appear doing so is no panacea from what I have read. Luckily boats do not get struck on mass, it all comes down to luck really...