A 15-minute classroom map. Dark raster first — no API key. Relief, political outlines, bathymetry, or satellite on demand. Click a plate, a volcano, a quake, a current, or a country. No Google.
Default basemap is CARTO Dark Matter — classroom raster, no API key. Vector coast is OpenFreeMap Fiord if you want it. Relief is OpenTopoMap. Bathymetry is Esri Ocean / GEBCO. Satellite is Esri World Imagery. Overlays simplified for class — not a GIS desk. Pan, pinch, double-click zoom, keyboard +/−. Scale bar is metric. Cursor click is lat/lon.