TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

Navigation bug when going reverse

Discussion in 'Model S: User Interface' started by Darren, Jul 22, 2013.

  1. Darren

    Darren Member

    Joined:
    Dec 1, 2012
    Messages:
    71
    Location:
    Los Altos Hills, CA
    I noticed this bug this weekend when I was using the navigation function.

    I set a destination and navigate to it.

    I put the car in reverse and go backwards.

    The navigation updates and thinks i'm going the opposite direction, so the route readjusts.

    I put the car in drive and go forward. The navigation changes back.
     
  2. NigelM

    NigelM Recovering Member

    Joined:
    Apr 3, 2011
    Messages:
    13,257
    Location:
    Sarasota, FL
    That's not a bug.....it's playing with your car.:rolleyes:
     
  3. PhilBa

    PhilBa Active Member

    Joined:
    Apr 20, 2013
    Messages:
    1,355
    Location:
    Seattle
    Definitely not a bug - you were going a different way so it tried to accommodate you. There's no way for it to know you are driving in reverse.

    A similar thing happens when you are parked somewhere, set a destination and then have to turn around. As soon as you start moving forward, it thinks you going a different way but when you complete the turn it switches back.
     
  4. kjl

    kjl Member

    Joined:
    Jun 4, 2013
    Messages:
    91
    Location:
    SF Bay Area
    Are you sure? Unlike your phone, which you may be holding in any orientation inside a car (so nav apps must use location deltas to guess your direction), the car should know exactly which way it is facing, no? Indeed, when I check "my location" on the Tesla App, the arrow is extremely accurate regarding the direction of the car, even when I have parked it in a parking spot by turning 90 degrees, completing the rotation right as I finish parking. i.e. I could not have been moving far enough in the direction the car is pointed for the change in location to have provided an accurate direction reading; therefore there must be directional information coming directly from the GPS.
     
  5. PhilBa

    PhilBa Active Member

    Joined:
    Apr 20, 2013
    Messages:
    1,355
    Location:
    Seattle
    Does it have a magnetometer or use successive gps reading to figure out direction? I had exactly the scenario I described last night - it had me going the opposite direction before starting out, flipped as I pulled out and then flipped again when I had completed the turn. This took maybe all of 5 seconds. It surprised me that it did that so fast. If it has a mag, it could be biasing towards the GPS readings over the mag. The gps in the tesla seems really good, by the way, the updates are very quick. Phones use a lower update rate to save battery so you get a coarser set of points.
     
  6. kendallpb

    kendallpb Model S: P 8061

    Joined:
    Oct 29, 2010
    Messages:
    1,185
    Location:
    MD, USA
    Maybe it thought you were going to be driving in reverse the whole time. ;-)
     
  7. Plug Me In

    Plug Me In Member

    Joined:
    Nov 29, 2012
    Messages:
    580
    Location:
    Central Virginia
    Geez, how far are you driving backwards? Unless you're navigating 3 houses down, I would think you'd have to go pretty far before it wants to change the route.

    Reminds me of a Car Talk not too long ago when they're talking about their Dad giving directions. He starts out by asking "Which way is your car pointing?"
     
  8. Darren

    Darren Member

    Joined:
    Dec 1, 2012
    Messages:
    71
    Location:
    Los Altos Hills, CA
    I went reverse for literally 2 feet and the navigation immediately re-routed me. Try it out!
     
  9. twinklejet

    twinklejet Member

    Joined:
    Mar 10, 2013
    Messages:
    666
    Location:
    Singapore
    It might know you're going in reverse, but for how long it would have no idea. You could be planning to drive in reverse for the next 1 hour to your destination!
    You would then complain "why didn't the nav accomodate my reverse driving style! can't it see i'm already in reverse?"

    Tesla can't please everyone.
    Perhaps the car should prompt "Hello, I see you've switched to reverse while I had assumed you wanted forward navigation. Are there zombies coming at us from the front preventing further forward travel? We can attempt to bash through them, or I can re-route us in reverse to the destination if you'd like. Please select..."
     
  10. kvietor

    kvietor Model S S280 VIN 168

    Joined:
    Dec 12, 2010
    Messages:
    294
    Location:
    Lithia, FL
    Come on guys, the car nows which way it's pointed and which way it's traveling. It can't account for which gear you plan to use. It's not a bug and it's not something which needs fixing.
     
  11. kjl

    kjl Member

    Joined:
    Jun 4, 2013
    Messages:
    91
    Location:
    SF Bay Area
    Interesting - I went in reverse for about 5 feet and it rerouted me. On the Tesla App, however, the arrow flipped back and forth between the direction of travel and the direction the car was facing.

    I suspect the car does know which way it's facing but the nav system uses successive position readings to determine direction.
     
  12. steve841

    steve841 Active Member

    Joined:
    Jan 17, 2010
    Messages:
    1,398
    Location:
    Ft. Lauderdale, FL
    Maybe I'm missing something here ....

    Nav in reverse seems like an oxymoron ...

    Call me crazy.
     
  13. hfmalom

    hfmalom Member

    Joined:
    Jan 30, 2013
    Messages:
    13
    Location:
    Frisco, TX
    One Gear(?)

    Doesn't the Model S have only one gear? The difference between drive and reverse is based on reversing the DC current on the motor(?). Simple even in reverse!
     
  14. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,761
    Location:
    Texas
    When I'm in reverse, I'm not looking at the Nav system. I hope you aren't either.
     
  15. gregincal

    gregincal Active Member

    Joined:
    Oct 26, 2012
    Messages:
    2,138
    Location:
    Santa Cruz, CA
    I'm going to do a "come on" the other way. It's ridiculous to say the Nav has to account that you might want to drive backwards. I don't think it's a big deal, and if you're reversing you're could be in a car park and not pointed the way you want to go anyway, but I would think the direction the car is pointed is probably better than the current direction of travel for Nav. As I say, though, I don't think it's a big deal.
     
  16. Francis Lau

    Francis Lau P-1456

    Joined:
    May 27, 2012
    Messages:
    514
    Location:
    Bellevue, WA
    Oh come on! I saw James Bond do it - drive in reverse using the backup camera. Now with a MS, we can do it with the camera and nav - it will even tell us what time we will get there in reverese. Now we just need the option to plunge into the ocean and convert into a submarine!
     
  17. PhilBa

    PhilBa Active Member

    Joined:
    Apr 20, 2013
    Messages:
    1,355
    Location:
    Seattle
    Maybe this should be renamed the "Oh come on" thread - like some one is telling a huge bullshit story. I love how people pick things apart to prove how in-the-know they are.

    As for nav in reverse, of course I don't ever look at it. But I do after I've completed backing up and if it's still showing the directions that it switched to when in reverse, it's going to be a moment of confusion. Even though I didn't back up yesterday during the situation I described, it definitely confused me for a second as it was a different route from 5 seconds earlier. Still, it's not a bug, it's just a side effect of a very fast GPS and routing system.
     
  18. Musterion

    Musterion 18h 03m 37s −24° 23′ 12″

    Joined:
    Jan 10, 2013
    Messages:
    337
    Location:
    M8
    "Forward" and "Reverse" in the MS are relative terms and don't necessarily indicate direction of travel. Don't forget about all those people who drive in reverse "gear" while going forward down a hill, so you can use the accelerator as a brake and get full regen -- Things you may not have discovered about your Model S?! - Page 26. Then you wouldn't want Nav caring about D vs R. Haven't tried it yet myself though.
     
  19. AmpedRealtor

    AmpedRealtor Active Member

    Joined:
    Jun 30, 2013
    Messages:
    4,705
    Location:
    Buckeye, AZ
    How is this a bug? All of my GPS in all vehicles works the same way. This is a good thing.
     
  20. kjl

    kjl Member

    Joined:
    Jun 4, 2013
    Messages:
    91
    Location:
    SF Bay Area
    It's not necessarily a "bug", but it's doubtful that it's what you actually want. e.g. it can be a little disorienting if you need to back up out of a parallel parking spot (or worse, shimmy back and forth a few times), and the GPS keeps rerouting you each time you switch: am I supposed to go forwards or do a U-turn right now? Halfway through turning around you run out of space, so you need to make it a K turn instead - you back up, and the GPS reroutes you again, etc..

    It's not the biggest deal in the world, and likely not even considered a bug, but the preferred behavior would be for the GPS to route based on the direction my car is facing.
     

Share This Page