I could use a little help from the experts choosing my first GPS/Chartplotter unit.I own a 1973 Oday-23 and do my sailing within Narragansett Bay (Rhode Island). My wife and I are months away from retirement and are looking to upgrade to a larger boat to enjoy some cruising getaways. Because I've sailed the bay I never had a need to buy a GPS, but things change and now I'm in the market.I like older boats and have rebuild several over the years (see enclosed photo of the fleet). I currently own a 1972 Classic Century and the Oday. I would like something small that I can move from boat to boat. Naturally, money is always an issue and I'de like to get the most bang for my bucks.I bow to your combined wisdom and ask if anyone has any suggestions for this broken dowm old bay sailer?Thanks for your help!