Have you checked Howard at Outer Banks Marine Electronics in Nags Head. He is the go to guy for all Charterboats. He is known as a Furuno specialist, but sells and services all brands. The biggest and best Service place in the area. As far as Electronics goes his knowledge blows away West or Manteo. I would check him out before you buy. Now your question about a Reference Tool or Informational Site is a very, very loaded question. Your head will literally be spinning. Look at your budget, physical space and they overlay your needs. As a long time boater, I would stay away from the cheaper lines, except for price limitations. Small boat use, probably Garmin if it fits your technical needs and budget. Most Charterboats use Furuno, Garmin, some have some Simrad.
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