Routes doing "weird" things, sending me around in circles

TheStammeringBiker

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So this might be one for the like of Wapping to dissect, and I wish I had taken some pictures of the satnav at the time to be able to bolster the evidence, but on my last 2 trips away the XT has been doing "strange" things.

Long story short, I created all my routes (as always) in MRA, made sure I had a decent amount of waypoints to keep the route on track, then sent it to the XT, checked that the route looked ok and that the mileage matched up and made any changes as required. This approach has mostly worked fine for me over the last 3 years I've owned it. But my last 2 trips away it's been acting odd to say the least. I was running the MRA app on my phone alongside it with the same routes loaded up.

One consistent thing I noticed is that I'd be approaching a junction and I'd just said to my wife "my phone thinks we have 235km left but my XT thinks we have 256km left" and as I got to the junction the MRA app wanted me to turn left for instance, and showed that the next waypoint was maybe 7km away, but the XT wanted me to turn right and at some point come back on myself to head the way that the MRA app wanted me to. Basically the pink line went up to the junction and then in both directions.

Once I ignored it and turned left it then corrected itself, the mileage left dropped and it agreed with the app, but this happened almost every day on every route, multiple times. My wife was insistent I'd placed a waypoint and the XT was wanting me to go that way, but there definitely wasn't. It was also not a dual carriageway/motorway where I'd possibly put the waypoint on the wrong side of the road (which I've stupidly done before).

In some cases the XT wanted me to do some weird turns to eventually just come back out onto the road I should have been on anyway, again, there were no nearby waypoints that would logically explain the behaviour. In some cases reloading the route fixed it, other times it didn't. The XT has never been this inconsistent so I'm struggling to work out if this is user error somehow or not. When viewed on the device the routes all looked fine with no obvious circles or weird routing.

Also, and this is a more a side note, for the first time ever this trip I had to use the "find me a petrol station on my route" feature, twice, and both times when either adding it as next stop, or adding to active route, the Garmin wanted me to go to that waypoint, then backtrack all the way back to what would have been the next waypoint in the list. I guess this could be by design but it feels odd that it wouldn't try to incorporate it into the order of waypoints to avoid this.

Oh and for clarity, on my MRA routes only the start and destination were the "hand" icon's, all others were just via points.

Thanks in advance, and sorry I don't have any clear screenshots or pictures to illustrate 🤦‍♂️
 
This should explain it :-


I found the XT infuriating when I started to use it having used several Garmin units since 2005. It does have a few quirks compared to those units but once understood you can avoid them. The biggy for me was turning imported routes to saved routes. An easy way to do that is in the link as well.
 
This should explain it :-


I found the XT infuriating when I started to use it having used several Garmin units since 2005. It does have a few quirks compared to those units but once understood you can avoid them. The biggy for me was turning imported routes to saved routes. An easy way to do that is in the link as well.
Thanks for this!

Sounds very similar but I was never sent back the way I came, but in fact a different route, only to then turn around and get back onto the original route, in essence it wanted me to ride roads that were never part of the route. But I will give this method a go and see what happens, but I did notice this happening even if I never deviated from the route the XT laid out.
 
Another possibility is the XT if set to faster time preferentially selecting faster roads that are actually longer and slower. For example in this route

Lim.jpg

The route has nothing between the shaping point highlighted and the flagged waypoint. Basecamp calculated the Route using faster time along B roads, which I was happy with.

When executing the route the XT followed this path (marked in red) which was clearly longer and slower but on A roads which the XT "Faster time" algorithm favours even though it took me through a town.. The only answer to get it to follow the roads you want to be on is to make sure that there is a shaping point or waypoint on each road you really want to take.

Lim2.jpg
 
What do the words I have highlighted below mean? How and what changes did you make to the route after you’d sent it to your XT, please?

I created all my routes (as always) in MRA, made sure I had a decent amount of waypoints to keep the route on track, then sent it to the XT, checked that the route looked ok and that the mileage matched up and made any changes as required

Quite often it’s helpful if you can share the original MyRoute route with the forum, along with a screenshot of its shape, total distance and estimated time. Bods can then load it onto their XT devices, to see what it offers up. I am away from home at the moment, without my XT but hopefully someone will give it a go.

:beerjug:
 
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I have been thinking about this problem. I think I saw much the same thing when I was running a route (created by someone else in MyRoute) on my XT.

As I half recall, about halfway around the route, it too told me to make a turn at a T-junction, which made no sense. I ignored it. After a while my XT developed demonic possession, resulting in a screen which looked like this:

IMG_2318.jpeg

IMG_2316.jpeg


As you can see, the ‘laser beams’ moved, squirting from different points, whilst you can still see the original route as well. Neither of the corruptions radiated from where I was, as you can see from the positional cursor. But they do radiate from fixed via points (orange flags) and cut off when they hit the route. I suspected that they squirted to hidden breadcrumbs which sat behind the magenta route line.

The only cure I found was to stop the route, delete it. then reload it.

I ruptured my Achilles shortly thereafter and haven’t been able to ride my bike since, so have not been able to see if I can replicate the problem.
 
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I have been thinking about this problem. I think I saw much the same thing when I was running a route (created by someone else in MyRoute) on my XT.

As I half recall, about halfway around the route, it too told me to make a turn at a T-junction, which made no sense. I ignored it. After a while my XT developed demonic possession, resulting in a screen which looked like this:

View attachment 279777

View attachment 279778


As you can see, the ‘laser beams’ moved, squirting from different points, whilst you can still see the original route as well. Neither of the corruptions radiated from where I was, as you can see from the positional cursor. But they do radiate from fixed via points (orange flags) and cut off when they hit the route. I suspected that they squirted to hidden breadcrumbs which sat behind the magenta route line.

The only cure I found was to stop the route, delete it. then reload it.

I ruptured my Achilles shortly thereafter and haven’t been able to ride my bike since, so have not been able to see if I can replicate the problem.
Sorry Richard for the delay in replying, I hope your achillies is well on the mend, I've had friends who this has happened to and it doesn't sound pleasant to say the least!

I've been back through my routes and unfortunately I cannot get any of them to misbehave by simply opening them on the XT and then viewing the route so I'm really at a loss as to what the cause was, I should really have taken pics when it happened. All i can say that is that in multiple instances the XT showed me going down a straight road for several KM, which matched up with the MRA app, then at a T junction onto another minor road this is where they diverged. The MRA app wanted me to go left and the XT wanted me to go right. But it was evident that the XT at some point was going to turn me around and bring me back to this point.

I'd assumed that there was a waypoint to the right which the MRA app had intelligently skipped, but there wasn't. The next waypoint was indeed to the left and several KM away. The road in question didn't have lanes where I could have placed the next waypoint on the wrong side of the carriage way but as soon as I took the left turning, within a few KM the XT sorted itself out and got back on track.

Same thing happened to my friend recently when we were both away, both had the XT, same GPX file imported, same route avoidances and preferences and there were instances where his was different to mine in terms of which direction it wanted us to go, in all instances though ignoring and following the MRA app proved the right course of action.
 
Thank you.

Your MyRoute / T-Junction / XT experience matches my own. Why it happened is a mystery.
 
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I have cut several posts out of this thread, moving them into threads of their own.

This was in the hope of keeping Peejay’s thread on topic and relevant to his problem only.


Richard
 


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