my way of navigation on the go is:
create a route on google maps website (i.e. not the app)
copy the link into mapstogpx.com
save the gpx file on the phone
open it with garmin connect (i assume you can open gpx files with wahoo app?)
send the course to the gps unit via bluetooth
would this work with wahoo?
It would work, it would just be sub optimal. My trust of Google maps cycling directions for anything more than say the train station to a hotel in the same city is minimal. I've been almost shot, after following Google cycle directions before, so tend not to trust it.
I could use the wahoo apps routing feature, but it doesn't provide flexibility beyond a to b, tho it uses either the Komoot or ride with gps engine for picking the route.
In theory I could follow Eurovelo 15, which shy be sign posted, but if it's anything like when I followed ev6, both the route, and the signage was a bit like sustrans. The longest route between 2 points, and half the signs were missing...
J