So rater than argue about it we complied.
Also the Xantrex Freedome 2000 inverter\charger wanted one installed as part of their grounding requirements.
We installed it in the starbord lazerett.
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We are currently cruising our Islander Freeport 36 sailboat in Mexico. We have been extensively documenting our outfitting for this adventure. Also, what works and what is not of value.