Find the highlighted Vëlosummer 2021 routes on your Garmin device; the layer includes all routes and links. Get the file here (if needed, right click and Save Link As…), and copy velosummer.img to the folder Garmin on your device. Tested on a Garmin Edge 1000 and 1030plus.
If you’re using a recent firmware, make sure that you are using the Classic” map theme (and not high contrast or mountain biking).
Left with 5 litres of “eau de Cologne” and drank it before arriving at destination so I had to refill on the way. Feeling of freshness when it was only 30 degrees; also the breeze was welcome. Fortunately the cycleway was full of families so it was another reason to take it easy. Lunch break and quick visit of Bonn (saw the HARIBO shop, good that it was closed 🤣). Met several cyclists doing long distance trip and discussed with one who was on his way to the Black Sea.