Sorry, I'll try to be clearer.  The Dyna plate is the ground for ham/SSB radios and not meant to be a lighting ground although it is used for that on many boats. Because it is designed for that purpose it is porous as that makes it a better counterpoise, which also makes it explode when struck by lighting.  Attached to it is the copper bonding material generally ran throughout the boat for the counterpoise. Gordon West recommends doing away with the Dyna plate and the copper strapping for radios and simply running a single wire to a good sea water ground like a thru-hull as the sea water is the best counterpoise there is.   A single bolt with the lighting ground wire attached to it and the outside ground to a point as Bud states is probably the best way.  It is solid and not likely to explode with a lighting strike.  Number eight or six wire is what is ran for my lighting ground but I haven't done the bolt yet.  Truth is nobody understands lighting real well and is the subject of intense study.  It was the major topic in Nat. Geo. magazine.

Jim