MK3 slow/misses exits sometimes wrong street/help-basically Nav gone insane

[Sparkles]

My nav seems slow in that it often tells me an exit after I've just past it. Plus, there are times when it just loses it mind. Sometimes the map shows driving parallel but a few streets over and once when it was ticked at me b/c I didn't follow the out of the way suggested route, when it should've caught up to me when I was on a road it suggested --the map drove me off-road up into the hills. It didn't sync for almost 30 miles.

I can't really trust it. If we are in an unpopulated area it does well. Fwy exits in LA? Can't keep up enough to tell me the right one unless it warns me enough ahead of time I can figure out which one it wants. Plus it would be really helpful to at least see roads coming up on the map but I mostly get roads I've past. Don't know if this adds to anything but sometimes I need to hit the accept screen again after driving awhile (maybe after going over a bump?). This happens often.

Is this fixable? Any ideas?

Sorry if this was asked before but didn't find much during a search. I have a '02 330cic with widescreen MK3 version V22.1 (1/63) which I believe is the latest version for the MK3.

[ccfj1]

Sounds like either the GPS antenna, the trimble unit or almanac(sp).

Have a look in the nav service menu and see if you have a fully populated almanac, aslo make sure that your nav can "see" the sky, do you get the small white dots around the satellite?

[Sparkles]

Sorry I'm a real noob when it comes to Nav

...I got into the Sevice Menu but the closest I could come to finding this out is "Almanac: Yes and Viewable Satellites: 6" If there is a further level down into the software I'm not sure how to access it. (Tried hitting menu key again but it kicks me all they way out to the main menu.)

Running MK3 version V22.1 (1/63)

[big bob]

That is the menu you need. Does it give any figures as to the signal strength of the visible sattelites? Are you in a built up or sparesly populated area?

Dud you find any data on the speed signal in the service menu? If there is a discrepancy it could cause you to miss exits. The speed signal is from the ABS sensor. Do you have an ABS fault?

[zeronoo]

check speed signal in service menu
regards