[mkgmap-dev] Wrong route on roundabout

Thu May 30 05:52:10 BST 2024

Hello,

I compiled my first gmapsupp.img and on test drive garmin offered an obviously wrong route on a roundabout (garmin.jpg). On OpenStreetMap i get the same wrong route with algorithm Car (Valhalla), but Bicycle (Valhalla) and other routing algorithms will give the correct route.
https://www.openstreetmap.org/directions?engine=fossgis_valhalla_car&route=58.93979%2C23.53421%3B58.93934%2C23.53611#map=19/58.93949/23.53509

I followed the instructions from
https://wiki.openstreetmap.org/wiki/Mkgmap/help/How_to_create_a_map

mkgmap \
    --route \
    --add-pois-to-areas \
    --bounds=bounds \
    --index \
    --gmapsupp \
    6324*.osm.pbf

Have I missed an important option? Is it possible to fix the problem in compilation phase or is it something confusing for Garmin algorithm in OpenStreetMap data? If it helps, then I have uploaded the gmapsupp.img for possible inspection to the address https://0x0.st/XNpC.img/gmapsupp.img

Any helpful insights are welcome.

Oskar Ohakas
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20240530/1ca0a282/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: garmin.jpg
Type: image/jpeg
Size: 68549 bytes
Desc: not available
URL: <https://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20240530/1ca0a282/attachment-0001.jpg>