This is not a feature directly in the PC*MILER User Interface, but there is a config file that can be edited.
- Browse to: C:\ALK Technologies\PCMILERxx\App
- Open user.cfg in Notepad
- Select [User Settings], then paste in the text below to replace:
[User Settings]
"DrawRouteMarks"=0 - Save File
- Restart PC*MILER