I bought the Garmin sd card a while ago and it's been working fine for me until recently. As you can see on the video, I just have navigation running so I can see where I'm going, but not being routed to a particular location. The GPS shows my location off the street and at times flying through the neighborhood even when I was still driving straight on the freeway. It's been like that for a week and removing and reinserting the sd card didn't help. If Im being routed to a specific address, it would be accurate though. I don't know if I should bring it in and if I do, would they be able to fix it.

 

There must be a reset for the Garmin? Have you tried that?

 

how do you reset it?

 

I know how to reset a full Comand system, but not the Garmin. I'm betting your owners manual however, tells you how.

That said to reset the full Comand system, you simply hold the CD eject button until the system resets. It wouldn't hurt to try that on your system.

 

damn, that is terrible. i may be getting a C300 with garmin soon, hope this isnt a common issue...has anyone else experienced this?

 

My guess is you are seeing GPS sensor errors which are typically 10 to 60 feet and vary in real time as satellites are blocked or reflections are encountered. Many of the hand-held Garmins that I have used have a user selectable option that causes the location indicator to "stick" to the nearest road or to the one it thinks you are travelling on. See if you have such an option.

 

The courtesy car I currently have has Garmin Sat Nav and does this every time also! Incredibly frustrating if you don't know where you are going and the roads are complex as the sat nav becomes totally useless, ended up having to revert to the iPhone and apple maps.

I tried resetting the system with the eject button (as you do on command) and it didn't do anything..