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Garmin Nav Fail

raiderma
over 2 years ago

With various planned routes, my Edge 830 provides stupid guidance on a section as I return home.

While riding eastbound, my 830 prompts me to head north for one block, east for one block, south for one block, then turn back onto my planned route. Today I finally decided to follow the bogus Garmin prompts. As I was heading on the north leg I received the "Off Course" warning. WTF? It shouldn't matter when following a planned route, but my nav settings are avoid major roads (which it ignores by the way as it does route me onto the US101 which is clearly a major road), and use shortest.

1. The nav prompts do not follow the planned route. Why is this?

2. Why is the 830 routing me the wrong way when it knows it's the wrong way?

3. My next bike computer will not be a Garmin unless I'm given a free upgrade to a computer that does all that the 830 was advertised to do. What are peoples experiences with other bike computers? I'm primarily interested in Wahoo and Karoo. Bryton is a no go for me as it requires a phone to navigate...it's cheaper to buy a phone mount. 

  • 0 over 2 years ago

    There are probably dozens of posts in the 530 forum on navigation and I assume an 830 behaves the same way, so check the route recalculation setting in your Activity Profile. (Activity Profile>Navigation>Routing)

    If you are following a planned route, turn it off to avoid stupid prompts.

    If you are navigating to a destination, it can be on, so the route can be recalculated if you make a detour.

  • 0 over 2 years ago

    It could be a map issue. If I knew exactly where it was, I could look at it and, maybe, fix it. PM me if you want  to keep it private.

  • 0 over 2 years ago in reply to dpawlyk

    Here it is: Downtown Ventura, CA.

  • 0 over 2 years ago

    What software / planning site did you use to "plan" your route and what map option did you use?

    The Garmin internal maps are based on Open Street Map (OSM) so it is wise to use OSM map option when planning a route, this will minimise (but not eliminate) the differences between the planning map and the internal Garmin map, (most planning sites will allow you to pick the base map to be used for planning the route). When there are differences in the maps the planning algorithms can make different decisions and thus lead you up a different garden path (or street)

    The OSM maps (and other route planning maps eg Google) have data defining the "connections" between paths/roads etc and to plan a route the software must be able to "join" the roads / paths together using the connection data. If the software can not find a "connection" then it will find another route, ie take you up a different street which takes you towards the next point on you route and / or destination.

    When you have planned a route and transferred it to the Garmin the Garmin will re-evaluate it against the internal map, generally making the same decisions as the original planning software but not always, your "avoidance" settings on the garmin can also effect the routing decisions

    All this assumes you are using the Garmin "Turn Guidance" that will give you the big white arrows at road junctions, you can turn off the "Turn Guidance" and the Garmin will not re-evaluate the route but will just display the route line on the map so you can make the decisions regarding following the route or not.

    There are few "secrets" regarding the route planning algorithms, have been programmed and re-programmed for decades and very little real difference between device brands, but the decision is yours. As with any tool having some understanding of its capabilities and limitations will help you better use the tool.

  • 0 over 2 years ago
    raiderma said:
    As I was heading on the north leg I received the "Off Course" warning.

    This I can explain. The off-course warnings are based on the track in the file. With "turn guidance" (the big white arrows).there are two "routes": one is the track and the other is a calculated route. (Note that "turn guidance" is optional.

    Obviously, the second calculated route should follow the track. If you do get a detour, you want to know about it. So, maybe, getting the warning is useful.

    When navigation is important to me, I usually have the map displayed. This lets me see odd things that are going on.

    Where did you get the screen shot from? I guess you drew the detour yourself?

    I don't know why the the device calculated the detour. I looked at RWGPS and didn't get a detour with a short course through there. I did get a detour (a different one) when I extended the course a few extra blocks west.

    The detour doesn’t make much sense. Sometimes, the device will pick a shortcut (but this is not a shortcut).

    raiderma said:
    but my nav settings are avoid major roads (which it ignores by the way as it does route me onto the US101 which is clearly a major road), and use shortes

    101 Business or the 101 freeway?

    The options are "interstate highways" or "major highways".

    101 Business is not a "highway" at all. So, these settings won't affect the use of that road.

     

  • 0 over 2 years ago

    Yep.  I can't offer more than already has been, but the times I've run into things like this it was a problem with the course or the map data.   e.g. in some cases the course was good but the map data though the street was one-way (though it wasn't) so the Edge navigated around it.  In another, the course looked good, the map looked good, but there was a discontinuity in the road, as if it was blocked, so the Edge dutifully created a route around it.  This has happened to me in more off-the-beaten-path  places, and more often in the past than nowadays.  It does seem surprising for something like this to crop up in downtown Ventura.

  • 0 over 2 years ago in reply to looigi

    I think the units should let the track override things like one way streets. The idea being that the person creating the track “knows more” about conditions than the map does. 

  • 0 over 2 years ago in reply to dpawlyk

    The screenshot is from plotaroute. 

    Garmin routes me onto the 101 freeway near the Santa Barbara County line when navigating to a saved location.

    I can not think of a valid reason for the Edge to not follow the route as planned. 

  • 0 over 2 years ago in reply to L.Rouge

    The route was planned on OSM and used with OSM maps that I loaded onto my Edge. I do not use Garmin maps as they are out of date.

  • 0 over 2 years ago in reply to raiderma

    It could be a map issue. It shouldn't be using the 101 freeway if "major highways" are being avoided (the 101 freeway is tagged as a "motorway".

    I wonder exactly where it redirected you.

    www.openstreetmap.org/.../396510

    It's possible (but not likely) that freeway is tagged as "bicycles allowed". If it was, that would explain the odd routing.