[mkgmap-dev] Strange long distance routes on Nüvi

Wed Jul 26 22:33:41 BST 2017

What needs to be embedded into the map, is the Location Table which maps
the location IDs in the TMC messages to roads, junctions etc in the map
network. The radio messages only contain location IDs, not lat/lon. 

Not all location tables are available as open data - each country has
its own ideas. I believe that the German OSM community has done quite a
bit of work on TMC in OSM, probably including the Location Table data.
But who knows how that information needs to be encoded in a Garmin
map... 

//colin

On 2017-07-26 22:47, nwastra wrote:

> TMC abbreviation: 
> Traffic Message Channel (TMC) is a technology for delivering traffic and travel information to motor vehicle drivers. .... have to be superimposed onto maps bymapping the reported location ...
> 
> N 
> 
> On 27 Jul 2017, at 1:46 am, Bodo Pfelzer <bodo.pfelzer at web.de> wrote:
> 
>> 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 Perhaps my questions is a little bit outdated, since there are good smartphone based apps for navigation.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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