I've now got Gosmore running well on a couple of Mios (WM5 and WM6) and the radomir routable osm maps running on Garmin (with TTS)
Gosmore enforces strict node connection for routing which is great for data validation whereas the radomir ones allow routing to close unconnected nodes and even along (the wrong way) very small segments of one way road. Therefore to clean up the OSM data running Gosmore on your home computer is ideal. However for mobile use the sutuation is difficult. The radomir maps for Garmin would be great if they understood roundabouts (Canberra consists of 1 million roundabouts connected by the occasional road). The gosmore interface, at this time, has less verbal instructions than the Garmin one and results in having to look at the display too much, which is OK for pedestrian use but is a problem for automotive use. I expect that the situation will change month to month and that things are only going to get much more exciting quite soon. PS on the weekend the OSM data refused to allow me to drive up Glen Osmond Road (up to the Adelaide Hills). Now back in Canberra, I've fixed the small section that had a one way tag on it.
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