Where the numbers come from
Every height, time, and crest on this site is copied from a public federal record or calculated from the station coordinate. Nothing is filled in when the source is empty.
Tides
United States high and low predictions come from the NOAA Center for Operational Oceanographic Products and Services. The datum is mean lower low water. Times are local time at the station. The page address uses the town and the county, and the NOAA station number stays in the data, not in the URL.
Australia and New Zealand predictions, including island territories, are calculated on this server from published harmonic constants. New Zealand ports use Toitū Te Whenua Land Information New Zealand data, licensed CC BY 4.0. The credit is written on the station page, not shown with the LINZ logo. Other stations in those countries use TICON-4 (Hart-Davis, Dettmering, and Seitz, 2025, SEANOE, https://doi.org/10.17882/109129), also CC BY 4.0. Heights are metres above chart datum. Times are local time at the station.
Town names
The name in the URL is a nearby Census place when the NOAA name is a creek, bridge, or inlet and that place is the closest one. Other towns and townships within a few miles are aliases: /nj/ocean/stafford opens the same chart as the town it belongs to. Census place and county-subdivision gazetteers supply those names.
Flood gauges
Coastal gauges are the National Water Prediction Service stations already used in the Tides Scout app, about 150 of them, not the full USGS river network. Historic crests and low waters are that service's published list. Storm paragraphs are attached only when the crest date falls during a coastal storm that affected that state.
Weather, sun, and moon
United States forecasts are the National Weather Service point forecast. Australia and New Zealand forecasts are from the Norwegian Meteorological Institute (MET Norway), in Celsius and knots, under the Creative Commons Attribution 4.0 licence. First light, dawn, sunrise, sunset, dusk, last light, the golden hour, the blue hour, and day length come from Sunrise Sunset for the station coordinate and are shown in local time at the station. If that service does not answer, the page calculates the same events. The moon phase on the page uses that service when it answers, and otherwise is counted from a known new moon. A polar station can have no sunrise or sunset on a given day. The guides define each line.