The major difference is that the proprietary ENC charts have been modified to be readable by certain types of hardware, rather than just generic PCs. The Navionics ENC maps can be used in a range of GPS chartplotters, but the NOAA ENC files can not AFAIK
There are also companies that distribute the NOAA ENC charts as a DVD, but "add value" by changing the way they are organized and listed.
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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.