Uh, trust those charts
at your peril. Assume they're incomplete and out of date. Use good paper charts and the GPS
as source of your location. Its charts should be relied on only to key you to where you are on the paper charts. And even they'll be out of date by 6-12 months.
To be clear, I'm not a "paper or die" Luddite, just someone who's learned that "just 'cause it's on a computer screen
doesn't make it so".