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Have you owned the boat since new? If not maybe it was something the previous owner added.It's over the port engine right behind the ladder. The clean out tray drain is toward the starboard from there.
I don't remember seeing any spots at the helm for a chart plotter.Plug her up!
Does it look like the previous owner had a chart plotter installed at the helm?
Nice fitting to fill the hole.The holes diameter is 1-5/16". I got this to plug ithttp://www.amazon.com/gp/aw/d/B003EWSZGW/ref=pd_aw_sbs_sg_5?refRID=1Q9FAPWZ6SDTTB4Y3A92