Enable the Lock On Road function in the Nav section - Routing, of the Activity Profile you are using. Possibly the device thinks you are off the Course - which as BTW is what Garmin calls a navigation of a route. RWGPS calls it a route. In Garmin speak, a “Route” is the track of the ride being created. There can be minor variations in your GPS position and what the map displays. Thus the device can think that 20 ft variation means you are off course. The Lock On Road function has the device understand that the drawn map is where you need to be, and you get fewer Off Course notifications as result.

If you are drifting off what the RWGPS file thinks is your course, the device will do a notification. You can turn those off as well, it’s in Navigation, just disable “Off Course Warnings”. As well pay attention and double check the RWGPS route you’ve created. I’ve at times found the software had me on a road I hadn’t thought I’d selected, this the device called an Off Course and this was just my own stupidity in how I drew the route.

Also note that my 64 year old eyes had issues with Wahoos display of turn-by-turn as they use white text on black background. I could not read this while wearing sunglasses on what is otherwise an OK black text on white background display. If you intend to navigate, the Garmin pop up TBT screen is far easier to read as it’s got text info as well as a map with a white arrow that shows the turn.