I'm looking to design custom UK road routes on a large screen, such as a laptop, then transfer to a portable GPS device for navigation in a car. I'm currently using Windows Garmin Basecamp connected to a Garmin Drive 52 GPS, but I find the software too clunky, slow and old to be usable. It would be nice to use Google Maps since it's so fast. Does anyone have any suggestions for hardware and software combinations? A phone app is OK for navigation, but I need a larger screen to design routes.