Parallax wrote:

Build a small computer display into the lenses of glasses. Wherever
you looked, they could either be transparent or display the positions
of buoys, etc and water depth contours superimposed on what you were
looking at.


Go to google.com, in the advanced search. Enter "video glasses",
without quotes, as your search criteria. Thousands of old pages.
Trouble is resolution seems to be, at best, VGA.