I have a relatively inexpensive Garmin Nuvi. I plan my routes in segments with a map in front of me and use the GPS to keep me on the planned route. I never entirely trust the GPS with my motor home and my life. Once it routed me over a single-lane dirt fire-service road in the mountains. Google "Death by GPS" to read some horror stories. I think the problem the OP relates is inherent in the mapping systems and not unique to any brand. Also, I've tried two mapping programs that are supposed to transfer the plan to the GPS and never found them satisfactory.