I worked 12 years at a marine dealership as a light tech. We carried Yamaha, Honda, and Amsoil grease. I always used the Amsoil water resistant grease. Partial to Amsoil, plus the blue color helped while greasing zerk/mechanical steering rams etc.
I assumed that the Honda was lithium.
I just found this:
This multi-purpose lithium grease containing anti-oxidants and anti-corrosion additives is formulated to withstand the harsh environment of saltwater, protecting against corrosion and wear. With advanced lubrication properties, it ensures smooth engine performance for worry-free boating.
Honda Marine Grease www.marinechandlery.com/products/mc-grease www.marinechandlery.com/products/mc-grease colored blue which was nice for visual while doing the greasing.