METOC GraphicsMIL-STD-2525E weather and ocean graphics as plain GeoJSON

Every graphic of Appendix M, symbol sets 45 and 46, on OpenLayers or MapLibre, with an editor that works on either.

GeoJSON in, GeoJSON out
A graphic is one feature with its drawn points and properties.metoc. Nothing about the view travels with it, and the root entry needs no map library or DOM.
Two renderers, one paint layer
OpenLayers and MapLibre draw from the same symbology code, flat or tilted over terrain, with screen-sized decoration at every zoom.
One editor for every engine
Draw, reshape, move, nudge, duplicate, undo and redo. The gestures live once and attach to any renderer through one seam.
Every Appendix M graphic
Fronts, pressure centres, isopleths, areas of weather, ice, depth, ports, navigation aids and mine warfare, in the standard's colours.
Marine warnings and ice charts
IHO S-412 marine weather warnings and S-411 ice charts, read from S-100 GML with their attributes and the WMO egg code, and exchange-set signatures verified.