It might seem old fashioned but I prefer the old paper maps to guide me,rather than
a Garmin Edge 705!
paper road maps doesn't need to be plugged in a electric outlet to become operational.
You can't say the same about a Garmin!
In this Journey from London to Portugal I used:
Michelin, Great Britain&Ireland (713) scale 1:1000 000 www.viamichelin.com
Michelin, Asturias Costa Verde(142) scale 1:150000
Mapa de carreteras de Galicia Escala 1:300000 Evereste Editorial www.evereste.com