I have a Garmin 590 Zumo. You can do routes. I have done a cross country routes on my computer and transferred them to my 590. I have also done some less complex day routes on the 590. You have to learn Garmin Basecamp to use your computer for routing and you have to connect the GPS to your computer to get the more detailed, secondary road maps that are on the 590. I guess you can buy a program from Gamin to load on your computer, I have not figured out what to buy so it matches the maps on the 590. Making routes is different on Basecamp, and for me, harder than the older Mapsource Garmins. The 590 has a large screen that is readable in the sunlight. It is too expensive. Given the other GPS options, I am satisfied with the 590.

Yes, I agree GPSs today seem to be more for point A to point B or finding a business units more than trip planning.