Hi Mark On 05/09/09 11:44, Mark Burton wrote:
Playing with my shiny new Nuvi 255, I notice that it can route across an OSM map of the UK pretty well. It can find long routes reasonably quickly. In comparison, mapsource 6.13.6 often fails to determine a route at all and when it does it is rather slow about it.
Previously someone claimed that on mapsource you needed a routable basemap to get good inter-tile routing, but that on a GPS device you don't. As the basemap is not sent to the device that makes sense. On the other hand the device may already have a routable base map and so perhaps it uses that if it has one and is the source of the observation. I know that on my Legend Cx which does not have a UK base map I do not get very good routing across tiles. ..Steve