The main reason I purchased the 5X was to use it while hiking. Others may find the turn-by-turn alerts helpful, but I do not. I've tried several things to turn them off:
Setting up the course in BaseCamp with the "Will not alert" option set.
Creating routes (without waypoints) in other systems (e.g. gpsies.com) and loading them in the NewFiles folder, as GPX tracks, GPX routes, FIT files, and TCX routes.
Nothing has worked. Every method I try, the 5X still alerts with a chime, vibration, and the black banner at the bottom with the distance to the point. It also seems like the 5X is throwing in additional alert points since it sometimes alerts even when there is no turn.
This behavior has been consistent with every version of the software I've tried. I just tried it again with 4.21, and there's no change.
I have to imagine this is a bug, since it's not respecting the "Will not alert" setting in BaseCamp. I submitted a report to the beta address, along with another issue I saw relating to BaseCamp changing a course to a track when the 5X is disconnected and reconnected; they responded looking for more info about that issue, but not about being able to turn off the alerts. I really hope this isn't standard behavior and will be changed in a future version - I don't want to hike with a device that's chirping every few minutes.
Has anyone figured out a way to turn these off?