Vclaw
4
You can create the GPX is JOSM:
Select all of the ways that are part of the route, splitting and combining them if necessary.
Then copy the ways, create a new layer, then paste it in. You can then save this layer as a GPX file or an OSM file etc. (Just don’t upload this layer to OSM, because it will mess things up!).
There may be better ways of doing this using other software, I’m not sure.
Then in Kosmos, there’s a box in the top left for Project Explorer. Right click on where it says “GPX files”, and choose “Add files”. I’m not sure if there’s anyway to change how Kosmos renders the GPX on the map?
Maybe a better way would be to change the tagging of the way in JOSM, before saving as an OSM file. eg if you tagged the whole way as highway=mycycleroute, then you can create a rendering rule in Kosmos to draw that in a particular way.
There was some discussion of this on the talk-gb list recently, see http://lists.openstreetmap.org/pipermail/talk-gb/2009-July/thread.html#4245.
I think the conclusion is bus routes are verifiable, as you can get on the number 42 bus and see where it goes, or follow it. Plus they are often signposted at stops etc.
But there isn’t anyway of verifying ‘unofficial’/unmarked cycle routes (except by copying other maps).