Tracking

[vmbosik]

I have been having a problem with my 05 prius and wonder if anyone else has noticed the same problem;
If I am driving on a road that is not where the computer thinks it is, the tracking will start to latch onto streets that are not on my route. This happens consistently when I go around a certain corner where the displayed road is off to the right of where the computer thinks it should be. The tracking will remain off in no man's land and latch onto the first road it crosses and never come back. The tracking symbol will not only losses its location, but will start moving in a direction different from the actual direction the car in heading. I have to use the menu to reset the cars current location and direction to get it back to where I am.

[efusco]

Is this area a new road? If so your '05 NAV disc may be out of date and not have that particular road on it.

It's also possible that your GPS loses its signal in that area (tall buildings, lot of power lines/mountains?). Possibly the reciever is broken, but that seems less likely.

Finally, any mods to the system? Are you disabling the speed sensor/dead reconing?

[mgipe]

<div class='quotetop'>QUOTE(vmbosik @ Aug 2 2007, 04:23 PM) [snapback]489643[/snapback]</div>

I have been having a problem with my 05 prius and wonder if anyone else has noticed the same problem;
If I am driving on a road that is not where the computer thinks it is, the tracking will start to latch onto streets that are not on my route. This happens consistently when I go around a certain corner where the displayed road is off to the right of where the computer thinks it should be. The tracking will remain off in no man's land and latch onto the first road it crosses and never come back. The tracking symbol will not only losses its location, but will start moving in a direction different from the actual direction the car in heading. I have to use the menu to reset the cars current location and direction to get it back to where I am.
[/b]

This happens with all GPS derived road navigation systems. Although there are techniques which reduce the frequency of occurance, all systems will get off-track occasionally. Usually, all you need to do is wait a while, until the error becomes large enough to force the nav system to rethink its placement.

It can be a bit strange sometimes, like when the nav says you are going north and you know you are headed west into

[vmbosik]

<div class='quotetop'>QUOTE(efusco @ Aug 2 2007, 06:36 PM) [snapback]489649[/snapback]</div>

Is this area a new road? If so your '05 NAV disc may be out of date and not have that particular road on it.

It's also possible that your GPS loses its signal in that area (tall buildings, lot of power lines/mountains?). Possibly the reciever is broken, but that seems less likely.

Finally, any mods to the system? Are you disabling the speed sensor/dead reconing?
[/b]

I had installed the upgrade version nav disk, and made and installed a hybrid nav disk but went back to the original nav disk that came with the car and it didn't help; it still gets lost. I also have installed a Coastltech lock pick.
Seems like something has changed lately because the corner where it has been getting lost lately never had a problem until a couple months ago, I have driven the route several times a month for the last several years without the system getting lost.

I don't know how to disable the speed sensor or dead reconing.
Would like to know how to reset the computer back to the original defaults but don't know how.

[efusco]

<div class='quotetop'>QUOTE(vmbosik @ Aug 2 2007, 07:17 PM) [snapback]489669[/snapback]</div>

I had installed the upgrade version nav disk, and made and installed a hybrid nav disk but went back to the original nav disk that came with the car and it didn't help; it still gets lost. I also have installed a Coastltech lock pick.
Seems like something has changed lately because the corner where it has been getting lost lately never had a problem until a couple months ago, I have driven the route several times a month for the last several years without the system getting lost.

I don't know how to disable the speed sensor or dead reconing.
Would like to know how to reset the computer back to the original defaults but don't know how. [/b]

First, if you drive it all the time why even look at it on the Map?

Next, the lockpick does disable the speed sensor and this disables the dead reconning, so it'll take around 20 seconds or so for the GPS to detect deviations from the standard course.



I wouldn't worry too much about it.

[vmbosik]

<div class='quotetop'>QUOTE(efusco @ Aug 2 2007, 07:42 PM) [snapback]489677[/snapback]</div>

First, if you drive it all the time why even look at it on the Map?

Next, the lockpick does disable the speed sensor and this disables the dead reconning, so it'll take around 20 seconds or so for the GPS to detect deviations from the standard course.



I wouldn't worry too much about it.
[/b]

The reason I want to find out how to resolve this problem is it is happening at least once a week in different locations. And when it starts tracking off in never never land it won't come back to my actual location. So I have to park and go through a lengthy procedure with the menu screens to get the tracking back to where I am on this planet. Otherwise, it just keeps tracking miles from my real location.

[efusco]

Oh, if it's that severe then I'd be inclined to blame the GPS reciever...I suppose the Lockpick could be implicated, but I don't know how.

[MPG > HP]

Have you tried recalibrating the GPS? There should be a menu option where you point the car due north, go into calibration mode, then drive a tight 180 or 360 degree turn, then done. Works in my '03 build Mazda RX-8 that uses much older '02 nav technology.

[vmbosik]

<div class='quotetop'>QUOTE(MPG > HP @ Aug 2 2007, 09:22 PM) [snapback]489727[/snapback]</div>

Have you tried recalibrating the GPS? There should be a menu option where you point the car due north, go into calibration mode, then drive a tight 180 or 360 degree turn, then done. Works in my '03 build Mazda RX-8 that uses much older '02 nav technology.
[/b]

There is a procedure in the Prius menu to re-set the car's current location and that is what I have to do each time it goes into never never land.
You go to Menu, Setup, and there is a procedure to set the location, and heading. And that works, only thing is I am having to do that every time the tracking goes crazy.

[qbee42]

<div class='quotetop'>QUOTE(vmbosik @ Aug 2 2007, 11:49 PM) [snapback]489774[/snapback]</div>

There is a procedure in the Prius menu to re-set the car's current location and that is what I have to do each time it goes into never never land.
You go to Menu, Setup, and there is a procedure to set the location, and heading. And that works, only thing is I am having to do that every time the tracking goes crazy.
[/b]

If the GPS is working you don't have to do this. What you are seeing is a loss of GPS data which forces the NAV system to dead reckon. The system then latches onto the nearest road. When a good GPS fix is obtained, the NAV system should automatically jump back to the correct position.

If your Lockpick is disrupting the speed input, then the dead reckoning is not going to work, and your position will stand still until another good GPS fix is obtained.

This leads to the next question: what is wrong with your GPS? If this is happening frequently and in multiple areas, then get it checked.

Tom