M_Boats: Zincs needed for my M17??

I have the boat in the water for the summer. Wondering about corrosion to rudder fitting, anything associated with the Keel or centerboard, and anything else that does not occur to me. It's in salt water, I do keep the OB tilted out of the water.What do you recommend? Any specific products or methods?Thanks,Tyler H.SeranitaM17 #232