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Discussion Starter #1
I've recently upgraded from the MKII to MKIII. The interface, graphics etc. Are improved, but the GPS has this new feature where it decides to map my location wherever the he11 it wants to. Half the time I am "driving" in the atlantic ocean. My son thinks its funny but I would kinda like it to work...

I did some research and found a good post where someone stated that the MKII has a "trimble module" that is mounted outside of the nav computer, on a bracket beside the CD changer. They mention this module should be removed. The MKIII's trimble module is integrated. Figured that was the problem, since the GPS antennae was still attached to the external module.

I plugged the antennae wire into the MKIII. I left the external module in the car since it has more than this antennae plugged into it. Like a radio ground or something. I tried unplugging the second wire from the old unit but it effectively eliminated my radio reception.

It seems that since I moved the antennae over to the MKIII (and leaving the old external trimbal unit in the car) the GPS positioning has gotten much worse.

Basically:
> MKIII installed with GPS ant. still connected to MKII external trimble module the GPS slowly loses accurate car tracking and current location. It "hops from street to street" etc.

> GPS antennae moved to MKIII unit from old trimbal module and tracking is non-existant. Car drives on the map pretty much wherever it wants. Half the time its a submarine.

Does anyone that has gone from MKII to MKIII know what to do with the old module/and or how to get the damn thing to position and track correctly???
 

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You have to unplug the power from the trimble unit, there are instructions on how to do so properly on bimmernav.com

Also, you should check that your GPS antenna isnt kinked or wrapped around somethng too tightly (minimum diameter for a loop is like 2" or something or it strts to malfunction).

The next thing takes a bit of patience, the car sometimes needs a bit of time to triangulate it's proper position. I remember when I upgraded to MKIV, my car was somewhere in DFW, Texas instead of Miami, FL. After about a solid day of driving around, it finally figured out where it was and hasnt missed a beat since.

http://www.bimmernav.com/BMW_E39_5_series_DVD_Navigation_Installation.html

Install instructions are from MKII to MKIV, but its exactly the same procedure
 

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+1 on all the points above. Also, there is no reason for you to leave the trimble unit there after unhooking the line to it.

Remove it and save yourself .25 lbs and increase horse power by .0000095 HP.
 

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There shouldn't be anything else plugged into the trimble module - it is a specific device dedicated to the MK2.

Did you MK2 work ok before (reception ok)?

Look in the diagnostic menu for the nav system (press Menu, select Settings, then press and hold Menu). Do you have signal from 8 satellites?

d-
 

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There shouldn't be anything else plugged into the trimble module - it is a specific device dedicated to the MK2.

Did you MK2 work ok before (reception ok)?

Look in the diagnostic menu for the nav system (press Menu, select Settings, then press and hold Menu). Do you have signal from 8 satellites?

d-
The module is only for the MK2 (and MK1?) gps navigation. MK3 & 4 have an integrated module. However, if you intend to sell your MK2, not including the trimble module will make the MK2 a nice noise maker when plugged in.
 

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Discussion Starter #11
OK - My problem was indeed leaving the trimble unit plugged in, and not connecting the antennae from this location. PITA to get to, but out now and GPS no longer has me driving in the Atlantic. My son will be bummed....
 
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