Currently I'm using Garmin's version of OpenStreetMap + an overlay for the Dutch cycle path network [1] on my watch.
[1] If you are in the Netherlands, this is a gem: https://planner.gps.nl/download.php?toolid=1 . Download the device version, copy it to your Garmin gpsr or Watch and you have a very nice overlay of the cycle network with nodes (knooppunten), etc.