Paul schrieb:
Johann Gail wrote:
I've tried now with r942 on a etrex and seen the following:
Crossing S/N borders seems to be no problem, routing gives more or less reasonable routes.
Crossing E/W borders doesn't work ok, as described by others too. In my case it alway finds a route, but the route is really not optimal. The inter tile crossing always takes place at a highway or a secondary one, even if start and destination are only a few kilometers appart and far from a highway.
My impression is, that routing on E/W borders doesn't work at all, but takes place at the basemap instead.
I've removed the basemap from my 605 and have the same East/West problems so I can't see how it can be doing that. As I've already commented what I saw was that when routing east I would be directed along primary roads until I'd crossed the tile boundary (I didn't measure this exactly but it was close) and then directly to the motorway after which the given route was what I would have chosen myself
Ok, the difference may then be only the road type primary one. As all primarys are in the basemap too, it is hard to distinguish.
It's time to eat humble pie. I managed to create a single tile with all the places and roads on that I've been testing and this chooses exactly the same route as the inter-tile file. It seems it was just a coincidence that the routes hit the motorway around the tile boundary.
I cant believe that, but will experiment with it later. In my case I choose start and end left and right from the border, with a distance of only a few km. The next primary road is about 15km away. I cant believe, that it is only a matter of optimization, as there is nearly a straight connection (lower order) between the two places. I will try to get this area in a single tile and see what happens.
I'm currently experimenting with different options for motorway speed and primary road class and speed as the routes being selected are (for me anyway) far from optimal
In general i can admit, that the choosen routes are not always optimal but at least reasonable.