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[mkgmap-dev] Strange long distance routes on Nüvi

From Gerd Petermann GPetermann_muenchen at hotmail.com on Thu Jul 27 07:08:00 BST 2017

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.

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Perhaps my questions is a little bit outdated, since there are good smartphone based apps for navigation.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

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