What mapping software

a paper map and a yellow highlighter works

if you know your route and want to stay on that route then just ignore the GPS. there’s no rule that says you have to obey the GPS. us? even if i know where we are, where we’re going and how to get there i keep the GPS running in case an unplanned route deviation is necessary.

I use 3 things while planning and traveling. My cellphone, paper map, and GPS for our travels. I also don't like the re-routing that the devices try to take you. This is what I do with the GPS, I look at the destination and my location. I then look at the map and look at the roads I want to take. I don't map the whole trip at once. I find a town on the roads where I want to go and set that as my destination and pick some random address in that town. When we arrive at that town I cancel that trip and start a new route for the next town along the roads that I want to go on. It has worked great but only once when I forgot to cancel the route and it had us on some ungodly roads. All of a sudden it dawned on me what I had done, not cancelling the route, it was a duh moment! I also use my phone for waze and rv parky to find camping along the way. My method has worked great for a number of years.

I use Google My Maps and export the route file to a .kmz file.
Then import that file into Garmin's BaseCamp. I use BaseCamp to "optimize" the route and export that directly to my GPS.

BaseCamp is very trying. It is not intuitive to learn.
After much patience, practice and applied intelligence, the BaseCamp software is becoming more useable.
I still prefer Google maps for finding stuff and laying out the route framework.

Rand McNally road atlas. We look at it before we leave and know where we are going.

Do you have a dedicated GPS or do you plan on using just your phone for navigation?