Weird navigation MRA to Garmin Zumo XT

[Con Hennekens]

It looks like your Zumo thinks a right turn is not allowed. It could be a map error on the Garmin map.

[Boštjan Kreutz]

@Con-Hennekens said in Weird navigation MRA to Garmin Zumo XT:

It looks like your Zumo thinks a right turn is not allowed. It could be a map error on the Garmin map.

Thanks for your comment, but I got these kind of glitches quite a lot lately... not sure if there are so many map errors all of the sudden.
I also thought that HERE maps in MRA are the same maps as Garmin's Zumo XT maps. Like same-same. So if there would be a map error then I should also see it on HERE maps in MRA, right?

[Nomko Nomden]

@Con-Hennekens @Boštjan-Kreutz
Garmin XT (which i also have) uses the NTU maps which is basically the HERE map with a few adjustments done by Garmin that turnes the HERE map into the NTU map.

@Boštjan-Kreutz
The suggestion made by that person on the Garmin XT forum makes only sence if the 2 lanes are splitted by a central reservation. If the two lanes simply lie side by side without a separation such as a central reservation than it does make no sense.

Also, the route is determined by the way the routingpoints/waypoints/shapingpoints are placed. Routes made in MRA always goed from 1 to 2 to 3 to 4 to ..... (you get the idea).

Just to clarify this:
Have you ever updated your Garmin XT device? Garmin provides updates on a regular base.

What your device is showing looks like some glitch to me. Check if you can update your device. In 99,9% of all cases updating the XT solves most problems.

Just 1 hint from me which i always do, i always places routingpoints/waypoints/shapingpoints after roundabouts. Just to be sure that my XT is following the road as planned.

[Nomko Nomden]

@Boštjan-Kreutz
It is recommended for XT users to turn off Automatic recalculation
Most will have this turned on but i have notices (and read on other forums) that turning it off also avoids "crazy stuff".

[Brian McG]

@Boštjan-Kreutz there may be slight differences in the maps from MRA & that you get from Garmin,
the 2 companies update the maps at different intervals,
but I do not think the map is the problem here,

First I used a simple route with 2 points either side of the roundabout, just the start green flag & the finish chequered flag, the simple route on my Zumo XT was good & the simulated path taken was correct

I then added a middle point before the roundabout in a similar location as shown in your picture
My XT gave a crazy route similar to yours

For the last test I just moved the middle point to the north side of the road & the route works correctly

For me this is just another crazy case of the Zumo XT doing stupid routing & why people keep repeating that you have to place the points exactly on the road.
This case proves even when the points look correct the XT will still get it wrong, it looks like it is trying to get to the little side road to the south towards the river

MRA navigation is a lot more, a lot lot more tolerant of point placement

Because of crazy stuff like this it is why I gave up on the Zumo & why it now sits in the bottom of a drawer
As I have said many times, IMO the XT is a piece of $&!7

(recalculate on/off makes no difference in this case)

[Con Hennekens]

@Nomko-Nomden said in Weird navigation MRA to Garmin Zumo XT:

Garmin XT (which i also have) uses the NTU maps which is basically the HERE map with a few adjustments done by Garmin that turnes the HERE map into the NTU map.

Yes of course, but they are not on the same version.

[Guzzist]

@Boštjan-Kreutz that's one of the reasons, I put the Garmin device in the ash tray. Since I use MRA-Navigation, I'm happy.
o.k. may that's not a solution you did expect - but I'm sorry, I don't have a better one.

[Boštjan Kreutz]

Thank you for all your answers and suggestions.

@Nomko-Nomden
Yes, I do update my Garmin XT regulary (the firmware and the maps). Thank you for the suggestion about placing the point after the rounadbout. Some folk on the XT forum also suggested this so there is something true about it. I will do my best to remember this when drawing the next route and see if I will have better luck.
(but also note that on that same trip I had another similar glitch which does not involve a roundabout; I just didn't have time this morning to create a screen shot from the XT)

Also I think I have a recalculation turn on, I have to check. I also don't quite understand how does device reacts when I turn this off, I have to read about it some more. Because I do want the XT to reroute me if I do some unplanned turn because of the sightseeing, road block, or whatever reason. That is why I also use shapping points (not only via) to easily skip them during route if need be.

@Brian-McG
Thanks for taking your time to do this test, I really appreciate it.
It would solve all my problems if I would see this odd behavior when planning on MRA. Then I would play with positioning the points. But in reality, when I am happy with route in MRA, I just send it to XT, and don't look at it anymore (until riding). I just trust the process, that everything should be ok.

@Guzzist
I understand and I also find Zumo XT not ideal. Perhaps I will one day change to these new Andorid devices and go with MRA Next navigation, but for now I must live with my XT. In general it works 100%… 50% of the time

[Nomko Nomden]

@Boštjan-Kreutz said in Weird navigation MRA to Garmin Zumo XT:

Also I think I have a recalculation turn on, I have to check. I also don't quite understand how does device reacts when I turn this off, I have to read about it some more. Because I do want the XT to reroute me if I do some unplanned turn because of the sightseeing, road block, or whatever reason. That is why I also use shapping points (not only via) to easily skip them during route if need be.

I understand your doubt about the recaclulation turning off.

But the main reason to do this which is also suggested on other forums is that, if you have a route and you want to follow that route from A to B as it is ploted and as it is intended, you turn it off to avoid any deviations/reroutes/etc.

I get the point that you want to be able to take an unexpected turn somewhere to the left or to the right. But kep in mind that your device might direct you back to a waypoint that you skipped.

[Mzokk]

I've tested this route on my XT and it works fine with no glitches.

My calculation mode is faster time.

When you open the route to navigate it looks like this.

If you set nav preferences to Garmin Adventurous Routing you get the little mountain box

When you press this before hitting go you can use the slider to make the route more wiggly.

I don't use it as it can bring you round housing estates and city streets and I prefer to put enough shaping points in to pin the route to the roads I want to be on. Could this have created your issue?

These days I use MRA for navigation and my Garmin for tracks and proximity alerted POI's. But if I do use it for navigation I run a track of the route to see where they diverge. Yellow track in this case beneath the magenta line.

[Boštjan Kreutz]

Thank you @Mzokk for taking you time to test. I am wondering if you would put another point in the middle of the route, where the sign 419 is on your image, would you get the same problem as me?
I am aware of the Adventurouse routing option, but I also didn't find the use of it. The idea is great and it is also one of the marketing reasons why I bought the Zumo XT, but in reality - as you said - it rarely discover new twisty roads in my area. In reality it actual drives me through the private/estate roads and city traffic.

Anyhow, I dig up some more of the other similar cases I got - all these are just from the last two rides And non of these has a roundabout or two lanes road.