(Sorry, another) Routes on device show as straight lines between waypoints

Former Member
Former Member
with Oregon 600 firmware V4.1.0, BaseCamp 4.3.5, & 24K U.S. Topo installed on GPS and in BaseCamp. Is there a way to get route data to conform to trails on the GPS as it does in BaseCamp with this combination?

The Setup/Routing/Lock On Road setting appears to make no meaningful difference but does create a pair of endless lines away from the Starting and Ending points when set to Off Road

Thanks