I plan my routes in Caltopo and have started using the Create Points feature to add a point every kilometre on the route. The points start at 0 and are prefixed with “KM”. The route and points are printed to paper and exported to Garmin Explore and inReach Mini 2. Comparing the points on the paper map and the inReach makes It’s easy to identify my location on the paper map.
Caltopo print output
InReach Mini 2 Route and Points (Show Waypoint Labels is enabled)

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Interestingly, the points also appear on MapShare on mobile (routes or activities don’t appear on MapShare on mobile/they appear fine on a computer), making it easier for people to follow along too.
MapShare doesn’t show routes or activities on mobile, but does show points.
I did reach out to Garmin support to get this filled as a bug, if you have a few minutes you should too: https://support.garmin.com/en-US/ql/?focus=topics