Ship weather reports and track maps are based on data reported via the World Meteorological Organization's Voluntary Observing Ship (VOS). Additional reports come from the YOTREPS network of cruising yachts.

Quality control evaluations for VOS ships are available at http://www.meteo.shom.fr/vos-monitoring/

Additional weather data comes from the NOAA Forecast System Laboratory's MADIS database.

Tide predictions are provided by a heavily modified version of David Flater's program Xtide.

Maps are produced using the University of Minnesota Mapserver, with datasets derived from the NIMA VMAP-0 layers, popularly known as the Digital Chart of the World. Maps are written in PHP/Mapscript.

Hurricane data comes from NRL Monterey