Planning a canoe route in the BWCA

I'm using the Nat Geo maps for the BWCA in Gaia and would like to be able to plan a route that would follow a shore line and snap to portages but also allow some straight line routing.

I found this thread to be very helpful https://help.gaiagps.com/hc/en-us/community/posts/115007106007/comments/115004535487