I'm endeavoring to get more proficient with using courses created in Explore and synced to my 67i. Many of my hikes primarily follow established trails but include sections that leave trails (for example, cutoffs to connect with other trails, approaches to peaks, avoiding areas that are seasonally not navigable, etc). If I create and save a course in Explore that initially adheres to a trail but I then need to go back to add or edit a section for off-trail navigation, I get very unpredictable erratic behavior.
Many times, if I try to add or relocate a point, the course immediately jumps to a straight line (direct) path from some other point. This happens regardless of which map layers are enabled. Toggling the road/trail vs direct icon (the one that looks like glasses) on/off before adding or moving a point doesn't seem to help. Occasionally, on some courses, things behave, but most of the time things go wonky and I have to discard the changes to start over until I maybe get what I want.
Any suggestions?