Night & Marine mode
Please note that "Night mode" is not optimized for using at night! It shows different colours of tracks/footways for faster/simplified rendering.
Daytime display on a nüvi
Night time display: no buildings, less landuse
Night mode is available in some units (older GPS units, Nüvi, Edge, new Etrex series). Although night mode is not possible in Oregon/Colorado/Dakota units, switching to the nautical mapview will 'reveal' this night display too:
Setup > Marine > Marine Chart Mode: Nautical
[NL Stel in > Maritiem > Maritieme kaartmodus > Nautisch ]
Nautical map mode on a Dakota