Producing nautical charts relies not just on hydorgraphic surveys and onshore positioning. It also requires observations of water levels made by tide measuring stations shown here.
With the NOAA 200th Celebration coming to a close at the end of 2007, maintenance of this Web site ceased. Updates to the site are no longer being made.
Producing nautical charts relies not just on hydorgraphic surveys and onshore positioning. It also requires observations of water levels made by tide measuring stations shown here.