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 Assume they're incomplete and out of date.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 And even they'll be out of date by 6-12 months.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".