A handy and recommended PDF sheet to complete before you paddle.
United State Coast Guard Navigation Center (very resourceful)
Local Marine forecast provided by NOAA.
Check the local radar provided by NOAA.
Check out Tidal Current Predictions for coastal waters in the United States.
Check out Water Level Tidal Predictions for coastal waters in the United States.
Get astronomical data, sun and moon rises/sets and more...
Find ocean conditions at NOAA's National Data Buoy Center
The Fleet Numerical Meteorology and Oceanography Center
A great website to View, Download, and Print, local marine charts for free.