[mkgmap-dev] crude routing of my gpsmap 276Cx

Thu Sep 26 09:31:42 BST 2019

Hi Manfred,

Just to make that clear:
I think that the long route is correct given the tags of the mentioned ways if the vehicle is a car. So, your first goal should be to correct the tagging.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von manfred.haiduk <manfred.haiduk at freenet.de>
Gesendet: Donnerstag, 26. September 2019 10:20
An: Development list for mkgmap; dd8kq at gmx.de
Betreff: Re: [mkgmap-dev] crude routing of my gpsmap 276Cx

Thank you for the information. I will try this later this week and keep you informed. BTW, i can remember some years ago when i have not used OSM Data on may Garmin but on a smartfone navigation system with OSM, there was the same fault on that device with a long detour. But after some data updates the routing failure on that device was gone

Von meinem Samsung Gerät gesendet.

-------- Ursprüngliche Nachricht --------
Von: Gerd Petermann <gpetermann_muenchen at hotmail.com>
Datum: 26.09.2019 09:52 (GMT+01:00)
An: Development list for mkgmap <mkgmap-dev at lists.mkgmap.org.uk>, dd8kq at gmx.de
Betreff: Re: [mkgmap-dev] crude routing of my gpsmap 276Cx

Hi Manfred,

I don't know the actual signs and I don't care if the tagging is right or wrong. At least the combination of bicycle=yes and foot=no on https://www.openstreetmap.org/way/25285589 looks very wrong:
bicycle=yes
fixme=check access rules
foot=no
highway=tertiary
maxspeed=30
maxweight=7.5
name=Brandenberger Straße
ref=K 30

Anyway, it seems that mkgmap sets the correct flags for the road, the Garmin algo seems to simply ignore the "no-through-route" flag when the detour is
too long. I've tried this with a sample file where the shortest route goes through a road with access=destination + highway=residential and the longer route
just has ways with highway=residential. As long as the detour is rather small Mapsource takes the longer (allowed) route when using the car profile.
All other profiles seem to always use the shorter route. So, either something is wrong in the map data (problem in mkgmap) or something is wrong in the Garmin algo.

Please try if you can reproduce the long route using a map created with mkgmap r4292 and the default style coming with that version.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von manfred.haiduk <manfred.haiduk at freenet.de>
Gesendet: Donnerstag, 26. September 2019 09:14
An: Development list for mkgmap; dd8kq at gmx.de
Betreff: Re: [mkgmap-dev] crude routing of my gpsmap 276Cx

For your additional information, i think the tag access=destination is to be seen with the additional tag for weight limit, as the street is not allowed to be used for cars heavier than 7.5 tons

Von meinem Samsung Gerät gesendet.

-------- Ursprüngliche Nachricht --------
Von: Gerd Petermann <gpetermann_muenchen at hotmail.com>
Datum: 26.09.2019 08:55 (GMT+01:00)
An: Development list for mkgmap <mkgmap-dev at lists.mkgmap.org.uk>, dd8kq at gmx.de
Betreff: Re: [mkgmap-dev] crude routing of my gpsmap 276Cx

Hi Manfred,

I tried to reproduce your results with BC but I get a different route.
at the moment I wonder why Mapsource shows the shorter route when using car/motorcycle. The ways
https://www.openstreetmap.org/way/25285586 and https://www.openstreetmap.org/way/25285589
both have the tag access=destination, so my understanding is that cars should not be routed through them, but this seems to be ignored.  I'll have to find out why.

Gerd

________________________________________
Von: DD8KQ <dd8kq at gmx.de>
Gesendet: Mittwoch, 25. September 2019 14:53
An: Development list for mkgmap; Gerd Petermann
Betreff: Re: [mkgmap-dev] crude routing of my gpsmap 276Cx

Hi Gerd

it's really weird. Trying this with MapSource you are right, there is no
long detour. But, then, i tried the same with BaseCamp and you know
what, BaseCamp produced on my Laptop this detour, see attached picture
Test2.

And just for testing, i tried the same area on a Smartfone running the
Navigator App with OSM maps, and this progromm is routing the same
detour, see picture screenshot.

So for me there must be something in the OSM Source regarding the street
K30 which will cause the strange routing. But my experience is too small
to figure it out

Am 25.09.2019 um 11:12 schrieb Gerd Petermann:
> Hi Manfred,
>
> No idea. I cannot reproduce the result with the default style in Mapsource. I tried with vehicle car as well as with cycling or pedestrian, I never get the long detour.
> Can you reproduce it with Mapsource? If yes, please provide more details about the routing settings.
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von DD8KQ <dd8kq at gmx.de>
> Gesendet: Dienstag, 24. September 2019 21:58
> An: Development list for mkgmap
> Betreff: [mkgmap-dev] crude routing of my gpsmap 276Cx
>
> Hi
>
> may be that somebody has an idea why the routing of my gpsmap 276Cx is
> so crude. I'm using almost the standard style to build my own garmin
> maps. And as the example is mostly in the vicinity of my hometown,i had
> not experienced this error before, as i need not a gps in my home area.
> If you look at picture 20190924_173131.jpg this is a routing i would
> expect to the destination, short and fast. If you look at
> 20190924_173229.jpg, the destination is only a few meters away from the
> first one, the routing is nearly three times more than before with the
> same settings on my device. I would appreciate any advice what to change
> or any hint where i can look for why this could happen.
>
> Btw, if i change the setting to use bicycle routing, the device will use
> for both destinations the expected way
>
> --
>
> #####################################################
>
>        Viele Grüße und 73 de Manfred Haiduk, DD8KQ
>        e-mail mhaiduk at t-online.de dd8kq at gmx.de
>
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>
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--

#####################################################

      Viele Grüße und 73 de Manfred Haiduk, DD8KQ
      e-mail mhaiduk at t-online.de dd8kq at gmx.de

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