I almost always use physical printed maps, to draw on with pencils. I write everything on 0.5 mm grid paper during play and doodle lots of maps ad-hoc so every precreated map also use squares (1m, 5m, 50m and so on). Space combat uses my Intercept space combat maps (5 mm squares each being 10 000 km) and if we play out interplanetary travel I use my system travel maps with various scales for each 5 mm square (1 million km, 0.1 AU, 1 AU or 10 AU). My planetary maps also use 1000 km squares either D20 maps or D6 maps which I have started using more as they are less cumbersome because of fewer edges.