- Center for Operational Oceanographic Products and Services (CO-OPS) collects, analyzes and distributes historical and real-time observations and predictions of water levels, coastal currents and other meteorological and oceanographic data.co-ops.nos.noaa.gov
- Low and High Tide Predictions for the Gulf Coast, Florida Keys, US East Coast, and US West Coast with Sunrise, Sunset, Moonrise, Moonset, and Moon Phase.www.saltwatertides.com
- csep10.phys.utk.edu/astr161/lect/time/tides.html