Nonetheless, this is meaningless to our problems. The best thing about this is that you don't have to press "Accept" anymore cause after 8 seconds is gone!!!
I'm still looking for posts from fellow New Yorkers who drive in Manhattan to see if they are getting the same errors I'm getting. I say Manhattan cause is the only place where it has happened!!!

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My v27 NAV finally got lost today. I parked the car in a underground lot, and when I returned to the surface even after it found 3 GPS satellites, it was unable to calculate the correct position. In the end, the system just rebooted itself.

Fortunately, once it restarted, it took a few moments, but it did manage to calculate the correct position.

I've had the NAV get lost before with previous version of the OS periodically, and also had the reboot .... only once before, in a two year period.

Have to see if it happens again and if so, if this is a recurring problem. Too little data right now to point fingers at v27 I think ..... Cheers, Adrian

Also looking for the same... Can anyone help...Looks like a couple of folks here have a copy.

Please share.

Thanks,
JC

This sounds like your nav system may not be getting data from the wheel sensors, which provides inertial guidance for times when the vehicle can't receive satelite GPS signals (such as in a tunnel or an underground parking garage)

You can look in the hidden Service Menu (go to the Settings screen and hold down the SELECT button for about 10 seconds) and see what the wheel sensor data shows.

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Xoutpost.com - where you come for the information but stay for the friendships

Thanks ... although I'm not so sure. In my case, The NAV computer knew the car was moving and changing direction, however didn't know where it was in space relative to anything else. Unless I'm not mistaken the wheel sensor can determine if the vehicle is moving, and the gyro inside the nav computer can determine if the vehicle changed direction .. but thats it.

And even when it did get the GPS signal again from 3 or more satellites to determine its location, it had a melt down and rebooted

New member here, great forum btw!

Anyway, using all the info contained here, I easily upgraded my 2003 E39 to v27. However, I did experience a GPS failure soon after. The GPS indicator didn't see any birds at all (no little white dots) and I noticed that my car was driving to the left of the road on the map. I went into service mode and noticed that there was no revision or sw version information for the GPS... it was like the car didn't even know there was a GPS installed. So, I did an IBus reset by disconnecting the negative battery cable for a minute or so, and now everything's back to normal. I haven't seen the gps issue happen since.

Now its off to the sat radio upgrade (I had a radio failure a while back that was covered by warranty and, thanks again to this board, I've found that the replacement they installed has the Sirrius fix).

Btw... there's no comparison between v27 and my old software! The map moves instead of the cursor on this version.... it's like having a completely different nav system installed!

Thanks for the feedback, and :xoutpost:

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Xoutpost.com - where you come for the information but stay for the friendships

Where is this happening? I had this happen to me too, but with v26 from the factory. This is in front of the Empire State Building.

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Dave Raines
2006 BMW X5 4.8is Le Mans Blue
R.I.P. 2002 M3 Cabrio SMG

hmmm... not sure what to think of this. First some background:

I found out about this Forum and the v27 software update because I was researching something my dealer was telling me when I had the car in to fix a nav screen brightness issue. The nav system was no longer automatically brightening the screen in bright daylight and my dealer was trying to tell me that there was no light sensor on my MKIV navigation screen!

Anyway, thanks to the great info here, I was quickly able to pull relevent service documents showing the location of the photocell which actually controlled this. Armed with these documents it was easy to convince my service manager to agree with my diagnosis (bad photocell) and order out a new screen for my MKIV. So far, so good.

Next, I performed the v27 upgrade and all was wonderful.

Anyway, today I dropped of the car to get the new screen installed and when I got it back, no birds, no GPS indicator, just a picture of Earth sitting in empty space while the car was driving to the left of the road again (see my previous post for why this happened initially).

This time though, the problem was different: The GPS sw version was correctly displayed, but GPS stats were showing "RCVERR" instead of "POS" and everything else was zeros.

So I called the dealer back wondering if the tech hadn't maybe bumped the antenna connection off but thinking to myself how could he do this when the GPS unit is in the trunk and he was working in the dash? My service manager said to drive it back and he would have the technician look at it. So I got back in the car and drove it back.

Imagine my surprise when about a block away from the dealership, I saw two white dots appear in the GPS area followed shortly by a GPS lock. I stopped in anyway and told my service manager about the RCVERR condition and he said he would chat with the technician about it and call me back if that brought anything to mind....

Wierd. Is this a problem with v27? Or, did the technician have the battery disconnected long enough that everything was wiped out. I've seen the GPS on my boat take up to 10 minutes to acquire a signal from dead off and maybe this was it. Heck, the gps didn't know what date or where on earth it was (lat/long was zeroed out too) so all its stored almanac data would have been useless and it would have had to resort to a "brute force" satellite acquisition technique.

Is this what's being experienced by other posters? It took a total of about 15 minutes of driving before my GPS started working again and during this time, the GPS stats were all 0's.

edit:

uh-oh.... blank earth again for about a mile on the way home then GPS suddenly appeared. After that, while in service mode, I noticed that my SNR on tracked satellites ranged around 03-07 with a couple above 10. Somebody want to go into GPS functions in service mode and tell me if this is what they see? I have no idea what "normal" SNR values should be. I'm still wondering if I don't have an antenna problem here... or maybe I'm just paranoid....