weird issue when inserting Via Points

Sometimes, when I insert a Via Point into an existing route, everything looks correct, but when I run the route in my Garmin, or view it again in Basecamp, the route will want to loop-back and cause a U-turn. It seems to occur between the inserted Via Point and the next intersection. I am careful about inserting new Via Points into the correct location within the route (between existing Via Points and not close to intersections). Deleting the Via Point and reinserting it at a different location can often resolve the issue. Has anyone else experienced this weird behaviour?

0 SUSSAMB over 2 years ago

This is often caused by placing a viapoint the wrong side of a divided carriageway

0 DriveAssist 51 over 2 years ago in reply to SUSSAMB

yes, that makes sense however this is occurring on simple, rural, two line roads

0 SUSSAMB over 2 years ago in reply to DriveAssist 51

Difficult to say then. Are you able to say which map and post an example file here so it can be looked at?

0 DriveAssist 51 over 2 years ago in reply to SUSSAMB

I can post an example but I do not see a way to attach a file ?

0 seilogramp over 2 years ago in reply to DriveAssist 51

Zip the file, then in a reply post Insert >> Image/video/file >> click Upload >> browse for file >> OK.
Or upload the file to a reputable file sharing service, such as OneDrive, Google Drive, Dropbox, make the file public, then paste a link to the file in your post.

0 DriveAssist 51 over 2 years ago in reply to SUSSAMB

The route performs a U turn between 5040 14th Sdrd (Via point 3) and 7598 Appleby Line (Via point 4). It U turns between the road intersection and 5040 14th Sdrd (Via point 3). It does this on each version of the map I have installed. I am currently using "City Navigator North America NT 2024.1". Also, the turn-by-turn directions do not indicate any U turn. I have observed this behaviour on a number of routes.route with U turn.zip

0 DriveAssist 51 over 2 years ago in reply to seilogramp

Thanks for the tip seilogramp!

0 SUSSAMB over 2 years ago in reply to DriveAssist 51

It's interesting, I can't see anything wrong with the route in BaseCamp but when you export it as a kml file and view it in Google earth there is an extra bit of the route that shows why it doubles back. Looking closely in BaseCamp that part of the route is a slightly darker colour than the rest of the route, showing it's two lines on top of each other. If you delete that point there is then no doubling back. Why it's happening with that point inserted I have no idea.

0 BTLAAKE over 2 years ago in reply to DriveAssist 51

I'm also at a loss for the U turns. Oddly, if you move the start point to Derby Ln or across Derby Ln the first u-turn disappears.

You really don't need all of those shaping points for that section of the route. If you only use your Start, Finish and 7598 Appleby Line point, it will create the same route without U turns. I try to use as few points as possible to shape a route.

There is also an odd pause at the corner of Appleby and Steeles Ave during playback.

Edit: It may be related to having two points on the same section of road that is between the same two crossing/intersecting roads. For example, two points on Bell School Line between Derby Ln and 14th.

0 DriveAssist 51 over 2 years ago in reply to BTLAAKE

The number of shaping points was really for the example. It wasn't a "real" route. However, I think you are onto something BTLAAKE with having two points on the same section of road. I have seen this issue before, and it may have been due to two shaping points, between intersections, on the same road. I do like to make use of shaping points as it really helps with getting the same route across multiple GPS devices, when shared across a group. Don't know why it happens, but I will keep a close eye on the number of, and locations of shaping points.