I had a similar problem, but worked out that I needed to export the course from Basecamp as a *.gpx file, and be sure they were being copied to the ‘New Files’ folder that was on the Garmin. There is another which I think is on the sd card ?
I’ve copied my notes for how to get a road route to work in my 800 if it helps anyone. This method throws up turn by turn directions – its great !
The maps show bike trails while other maps may not.
When you create the course use Google Auto Routing on streets, use OSM Auto Routing on bike trails.
When you are done creating the course; go to Summary, go to the bottom of the page under Save Course, name the course and then click the Save link. (the course is now saved to the website if you need it later)
In the Download section of the webpage NAME THE COURSE THE SAME AS ABOVE (this is what will show up on the Edge course list)
Remove check mark on “Add Course Point Warnings”.
In the download section of the webpage click on “To File GPX”. Save it to your hard drive but NAME THE FILE THE SAME AS ABOVE (by default the file name is course.gpx)
Import the course into Garmin Base Camp software, this step cleans up the file and makes it most compatible with your Garmin Edge 800.
Connect the Garmin Edge 800 to your PC.
Export the fileas a *gpx from Base Camp to the “New Files” folder on your Garmin Edge 800
Unplug the GPS and turn it on
Go to Menu/Courses and view the course to see that it looks ok
Before navigating the course make sure you have the following settings options set.
Go to Settings/System
/Routing = Calculate Routes for Bicycle
/Guidance Method = On Road for Distance
/Lock on Road = No
/Recalculate = Off