If you're laptop is connected to the GPS, there is no reason you couldn't use the NOAA charts instead of the Navionics.
It would help if you said what kind of computer you are on... MacENC is a good program for Macs... Fugawi has a pretty good package for Wintel machines. Neither is free IIRC, but you do get what you pay for... as the two packages I've mentioned probably are considerably more user-friendly than what you've down loaded.
SeaClear is a free program that is supposed to be fairly decent for Wintel machines.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.