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We have a Raymarine C-Series with the Gold charts, and we went down the ICW from Norfolk to Beaufort, NC (went outside after that). I'm sure this is a "feature" of most electronic charts, but many times we showed being on land as we traveled. Use the chartplotter for reference, but definitely navigate the ICW visually. In addition, Navigational aids are often moved around on the ICW due to shoaling, especially as you get farther south.
With regards to updates, it all depends on where you are going. Navionics just updated their Bahamas coverage. For a while, you had to buy the "Bahamas Special Edition" charts, separate from the east coast or central america charts. As of a month or so ago, they've integrated their changes.
Navionics does offer a $100 rebate when you do chart upgrades. You buy the new one and get a return envelope with it. When Navionics receives your old one back, they will send you a $100 credit.
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s/v "Pelican" Passport 40 #076- Finished Cruising - for the moment -
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"Don't dream your life, live your dream" - Bob Bitchin'
"I'll see it when I believe it" - Me
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