[mkgmap-dev] Question on routing difference

Wed Jun 8 12:46:33 BST 2022

Hi all,
we had some discussions on the weirdness of Garmin's routing algorithm
in the past.

In August 2014, I described an example, and popej could give a good
explanation:
https://www.mkgmap.org.uk/pipermail/mkgmap-dev/2014q3/thread.html#21825

Beyond that, "newer" Garmin outdoor devices (ehm, my Oregon is from
2013) have "activity routing" which causes odd artifacts even when you
think that you do not use it: it may send a car to a cycleway parallel
to a primary road. or a bicycle onto a motorway. Hence the trick by
ligfietser to use non-routable lines for non-cyclable ways is important.
Perhaps you can find the messages some where on the forum
https://forum.openstreetmap.org/

Regards,
Bernhard

Am 07.06.2022 um 16:16 schrieb lig fietser:
> Harri,
> Thats why I use on my Openfietsmap not routable lines for highways
> with bicycle=no.
> I misuse the avoidance of toll roads to force the routing to take
> cycle routes only.
> In my scripts I retag all highways that are not part of a cycle route
> relation with toll=yes,
> and all cycle routes with toll=no
> I also "upgrade" cycleways and lower classified roads, but this comes
> indeed with a penalty of
> slow or even impossible route calculations.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20220608/c924132b/attachment.html>