Wrong right-turn signal in roundabouts

I didnt see any flag of the sort when making the maps.  You just select the tiles and thats it.  I dont even know what the local regulations are.  For instance what about Zhuhai, Macau?  The user of the device shouldnt have to know all the local driving patterns.  Thats why you use the device to show you how and where to ride.  

How did you make the maps?  I use mkgmap to create my maps from OSM data and the command line has a specific flag for driving side of the road.  If it is omitted I think it defaults to drive on the right.  I actually create my maps from scratch.  I download the OSM data for the area I want, strip out the detail I don't need, and then compile the Garmin format maps.

If you are downloading maps where you just select the area you want the I would hope the backend systems that provide the map file sort this out properly.

I was able to confirm your solution by disabling Garmin Europe South West map and installing another OSM map (from http://alternativaslibres.org). Using this map, roundabouts are displayed as expected.

I have also opened a ticket with Garmin support.

I am still baffled how they can ship a map like this... smh.

Thanks again.

I went to garmin.openstreetmap.nl (which doesnt seem to be working due to server errors currently).  Then I selected open street maps (new/routable).  Then I got the map of the world and I selected the tiles corresponding to the area.  Then I clicked to make the map and soon thereafter I got an email with a zipped version of an *.img file which I then copied to the garmin folder on the device.  There was no other choices available. 

In that case you are just choosing the areas you want.  You have to hope the people behind that site compile the maps to take into account which side of the road is driven on in different countries correctly.  Maps from that source are correct for the UK.

The choice I was talking about is when you compile the maps yourself from the source OSM data.

Map problems can be caused by several things.  The source data (OSM in this case) could be incorrect.  No-one is going to check all the data so errors will be present in various places.  At least with OSM you can fix them yourself if you spot them.

When I moved to a new area a few years ago I got a strange turn prompt at a certain location.  I was always prompted to turn right when I was supposed to go straight on and the road looked as straight on the map as it did in real life.  This location was at a junction where a side road joined on the left.  After a while I happened to zoom right in on that area in an OSM editor for an unrelated reason and noticed there was a tiny kink in the route of the road (less than a metre) which wasn't noticeable when looking at the map at a normal zoom level.  Someone had inadvertently put it there in the past.  I removed the kink and those strange right turn prompts disappeared. The Garmin noticed that minute kink and thought it was a turn.

If roundabouts are tagged incorrectly in the OSM source then they won't work as expected when navigating.  I have personal experience of this and have fixed some roundabout tagging issues which then solved the navigation anomaly when the map used on my Garmin was updated.

There could be an issue with how Garmin processes the OSM data when compiling their maps.  Maybe certain tags get stripped out when they shouldn't.  Maybe the routing engine has a bug so in some cases it causes unexpected behaviour at certain junctions.

I agree. I have fixed local OSM issues in the past (was using a Wahoo Bolt until recently). I am a certified Garmin noob, not an all-round noob ;-)

However - in my case, the same course(s) will be missing all roundabouts in Garmin's map and show all of them on a downloaded map. Hence my conclusion that the problem is not the source map or the device, but the Garmin map / the way they extract it from OSM (or process it or whatever they do).

Furthermore, since you had a similar issue in your region, this isn't something limited to my whereaouts. So they need to do more testing before release. Many people will be irritated by this for sure.

I am just glad I have a workaround (thanks to you) and I will have another look at Garmin's maps in the future, for the convenience of automated updates.

I'll update this thread should anything useful come from Garmin support.

Australian here (Sydney). Both the original maps and the latest updates show directions the wrong way around roundabouts (anticlockwise). The 1st exit/2nd exit/etc suggestions are also incorrect, but separately.

i.e. the icon might show going straight on at a roundabout (the 2nd exit) where left and right turns are possible but it'll show going anticlockwise past the right-turn. It'll also say 1st exit?!

This is only a problem with roundabouts. Normal junctions are fine.

It sounds like Garmin incorrectly set which side of the road you drive on for that location if roundabouts are backwards.

Thanks. I will pass that information on.