Constellations
Orbital elements are fetched once and propagated in your browser, so nothing streams while you watch.
Vehicle type
Nothing selected means everything is shown.
Ship type
Nothing selected means everything is shown. A ship's type arrives with its static report, every six minutes, so freshly seen ships start as "not reported".
Minimum face height
Minimum quality
Water temperature
Defaults: 3 ft faces and Fair or better, which is what most people would paddle out for. Quality is a call from swell exposure, peak period and wind against each break's facing; nothing selected under water temperature means every band is shown.
Weather layers
Storms are tropical cyclones with an advisory in force (NHC, JTWC). Rain and snow are every 0.25° cell where the GFS weather model says it is falling this hour. Sunshine is assumed everywhere else.
Rain intensity
Bands are rainfall rate (WMO): light under 2.5 mm/h (0.1 in/h), moderate to 7.6 mm/h (0.3 in/h), heavy to 50 mm/h (2 in/h), violent above. Cells under 0.2 mm/h — a trace — are left out.
Snow intensity
Bands are snowfall rate: flurries under 0.1 in/h (0.25 cm/h), light to 0.5 in/h, moderate to 1 in/h, heavy above that. The rate is the model's liquid precipitation times a snow-to-liquid ratio that follows temperature (10:1 near freezing, more in colder air).
Rain over the tropical oceans and snow over polar sea ice are most of the area. The Stats lists follow these filters.
Aircraft colour
Category
Nothing selected means everything is shown.