Routing off main roads onto sliproads and back again...

tyclyd

tyclyd

Gary
UKGSer Subscriber
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Brecon, Wales, UK
Has anyone managed to come up with a fix for the recent trend for 660s to route you off motorways onto slip roads around roundabouts and back up slip roads to rejoin the motorway yet? All came to a bit of head yesterday when the 660 (up-to-date on both mapping and software) wanted me to leave the M4 a couple of times on my way back from London to West Wales – worse was around the A4 Hanger Lane section, did not like the A4 / M4 main road. No avoidances (apart from unpaved roads) enabled… as a comparison my Montana just routed me straight home!
 
I would look carefully at the preferences set up on your computer and on your device.

I would also have a look at how your recalculate option is set and at whether you were running an 'old route' ( one that recalculated on import) and / or if you were running a route that had been created outside of Mapsource / BaseCamp.
 
Mine does it too. No old routes and happens when i just give it a destination before the routemin even begins. Avoidance so are all off and the same. Latest mapping, old slip road and all maps are on device only
 
this can happen if you are set to "Shortest Route". It must save all of a couple of hundred meters! Garmin clearly have a sense of humour, if lacking a sense of direction.
 
Roger Chatterton said:
this can happen if you are set to "Shortest Route". It must save all of a couple of hundred meters! Garmin clearly have a sense of humour, if lacking a sense of direction.
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Mines always set to Fastest Route ....... And it still does it, but I fool it and carry straight on !!!
:D
 
It's to do with the speeds allocated to each type of road, in combination with your preferences.

In Mapsource, you can go in and adjust it, so for example if you want it to allow routing on main roads but would prefer 'b' roads, you'd set the average speed of the b roads for 50 mph and the main roads at 30mph.

The internal algorithms will still allocate chunks of main road to your route, but only (in this case) if the distance saving is 50/30ths greater, IYSWIM.

So in your actual reported problem of it taking you off down little side roads or junctions, you'd go in and LOWER the speeds on that class of road to something ridiculously slow to make them far less attractive to the algorithm, or raise the main road speed to force it to keep you on there.



I don't know if you can do that on Basecamp....it does seem (from what I've read) to be a bit dumbed down in comparison with Mapsource :nenau
 
Garmin features, as I call them.

Sometimes they trick me, sometimes - like Andres - I trick them. It's a battle of wills, a whiff of danger....
 
Well- never knew any of that! Very interesting.
Base Camp is very "Base-ic"..... and Garmin admitted as much when I challenged them at BMW bash at Garmisch-" there are still some issues with Base Camp on a Mac".....damn right there are
 
It’s a really odd inconstancy

It’s a really odd inconstancy, I would have thought that the routing algorithms for the Zumo and the Montana would be the same yet the Zumo has only recently started to do this – maybe it’s a map update issue as the Montana is running a single edition of the EU map mid 2013 via micro SD Card and the Zumo is on 2014.1 via LM updates
 
Wapping said:
I would look carefully at the preferences set up on your computer and on your device.
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I seem to remember this being reported as a problem about 8 years ago when I bought my 2610 - but I reckon Wappings nailed it.

If you have set your preferences for smaller roads in preference over motorways, the machine is only doing what you've asked it to. If you set your preference for motorways high, and preference for smaller roads low, it would be interesting to see if it still tried to direct you onto the slip roads.
 
I tend to read the road signs and tell the Garmin to STFU until I rejoin the pink worm.
 
The Grey One said:
just don't leave the UK!
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It's built on Google Maps, so it'll work anywhere that Google has data for (which I'd like to think includes Austria). If you're having any problems creating routes, please do let me know though - we want to be able to help if there's an issue.

:)
 
MotoGoLoco said:
It's built on Google Maps, so it'll work anywhere that Google has data for (which I'd like to think includes Austria). If you're having any problems creating routes, please do let me know though - we want to be able to help if there's an issue.

:)
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Google maps are very poor in our part of Austria, many errors and omissions and anyway your website implies it's UK only right now. I have given up reporting the errors to Google as they take little notice. It took 4 years of pestering to get them to remove a non existent road they had running through our terrace. Life is too short to go through that again. Not that Garmin maps are perfect either but they do have far, far less errors than Google do around here.

John
 
The Grey One said:
Google maps are very poor in our part of Austria, many errors and omissions. I have given up reporting the errors to Google as they take little notice. It took 4 years of pestering to get them to remove a non existent road they had running through our terrace. Life is too short to go through that again. Not that Garmin maps are perfect either but they do have far, far less errors than Google do around here.

John
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Fair do's - not a great deal we can do about that one I'm afraid, sorry!

The Grey One said:
And anyway your website implies it's UK only right now.
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For all it's worth - our accommodation and bulk of our user base is UK/Ireland based right now, but the route builder is truly a global entity. There are routes on there from all over the place, UK, France, Asia, USA etc. I sympathise with you on the lack of very local Google maps data though, because frankly that must suck a little.
 
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