The only need for the sintered bronze grounding plate that I recently removed from the bottom of my boat (broken & leaking into the hull through the attachment bolt holes, a replacement for which would have cost $216) was in case of having an HF/SSB radio. Since I'm not crossing any oceans SSB is not in my future.Then getting an HF/SSB radio and figuring out which antenna and length.
I got my FCC license in order to get an FCC MMSI number rather than the US only BoatUS freebie version because we cruise in Canada & with the FCC version the Canadian CG can get our data in case of a DSC distress call.