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[mkgmap-dev] Strange long distance routes on Nüvi

From michael.poesdorf at poesinet.de michael.poesdorf at poesinet.de on Thu Jul 27 08:43:31 BST 2017


I'm using my maps even for long distance routing. Typically 600-800  
km, Germany to Italy or Spain, Germany to UK.
My device is a Montana 600/610. I do not use my maps on the pc  
(mapsource, etc).
Adding additional (way)points helps me to control the exact route.

Regards, Michael

Zitat von Gerd Petermann <GPetermann_muenchen at hotmail.com>:

> Hi Bodo,
> the --tdbfile option has no effect on the created gmapsupp. My  
> understanding reg. long distance routing on the device is that the  
> algorthm needs memory which is limited.
> On my Oregon this typically results in one straigt line after  
> minutes. Maybe the nüvi uses a different algo. It would be  
> interesting to know if you can reproduce the problems
> in Mapsource because that would allow us to reproduce them as well.
> I stopped using the device for long distance routing (> 50 km), I  
> use internet services now and download the routes as tracks.
> I can only suggest to avoid long distance routing by adding  
> additional points.
> ciao,
> Gerd
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag  
> von Bodo Pfelzer <bodo.pfelzer at web.de>
> Gesendet: Mittwoch, 26. Juli 2017 17:46:20
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: [mkgmap-dev] Strange long distance routes on Nüvi
> I use a gmapsupp.img generated with a reduced  style derived from  
> the default mkgmap-style . Routing for cars works fine, if the  
> routes are short. But if I try to plan a long journey (1000 km). The  
> route calculation gets stuck for some minutes at lets say 80 percent  
> and finally comes to a result. But the resulting route is something  
> that looks like a concatenation of beelines. My assumption is, that  
> Nüvi contains an overview map of the world (or Europe) that I cannot  
> disable. Could I replace it using --tdbfile in mkgmap? But the  
> option mentions MapSource, I tried to avoid MapSource for now.
> Routing works fine, if I disable Motorways (or toll roads), but the  
> route seems to be somewhat inconvenient.
> Perhaps my questions is a little bit outdated, since there are good  
> smartphone based apps for navigation. But I love my old fashioned  
> Nüvi. This leads to the next question: Is there a chance that there  
> will be TMC information compiled into mkgmap maps sometimes in the  
> future? As far as I understand, nobody knows where it is stored  
> inside encrypted proprietary maps.
> Best regards
> Bodo
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> mkgmap-dev at lists.mkgmap.org.uk
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