First off, it would be best to open new thread…

I guess that once you’re off road, the gps would try to use an off-road way, thinking that it’s better to try that way, than to go straight as the crow flies.

Re learning how to edit, a good general suggestion about the internet:
If you want to do something that you didn’t do before, chances are that someone already did it.
Look at what they did, and try to copy their work.

talkat.