cavelamb himself wrote in
m:

Dumb question time?
What are the ENC charts?




It's an archaic old line drawing format used 30 years ago for drafting,
which every time I communicate with NOAA seems about the bleeding edge
technology of the staff.

There's an ENC viewer available from the website. I think it has been
updated to operate in the basic Windows environment, but maybe not Vista
which BillyDOS changed to try to force people to buy new software.