[mkgmap-dev] Nuvi routing performance

Sat Sep 5 17:15:31 BST 2009

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