I recently got a Fenix 5S+, ROW version, so it comes with US maps rather than local. I got routable China OSM maps from http://garmin.openstreetmap.nl/.
The routing seems to work, but I see an anomaly routing between HK Island and Kowloon. There are tunnels under the harbour between HK Island and Kowloon, but none for cycling or walking. The only options are ferry/car/metro.
Using the run profile, routing set to run/walk, I chose a destination in Kowloon. The calculated route went through one of the harbour tunnels (car). I was expecting it to say unrouteable or route via ferry - I got the same result with run settings->routing->Avoidances ferries on/off.
I am not sure whether this is an issue with the downloaded OSM maps, or an issue with the routing algorithm. Just wondered if someone with an APAC version and official Garmin China maps loaded could try the same, see how it routes.
Thanks