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The system probably is using dead reckoning instead of satellite signals. There is an icon on the screen that should display you are getting the GPS signals. I am betting it's not there now. If memory serves it looks sort of like this: (((o))). You should have a manual for the COMAND that shows you all this. There should also be a screen I believe labeled "Service" that tells you exactly how many satellites you are receiving, probably reading "0". More than likely the problem is the GPS antenna, or maybe the splitter.
Assuming you have Teleaid, you can try a test call on Teleaid and ask them if they can see your location, that usually narrows it down. If they can see your location, I'd guess the splitter, if they can't, it's inconclusive, could still be the splitter. The antenna by far is the most common problem.
Make sure you are testing all this with clear view of the sky, and if you try a test Teleaid call, and also don't do it right away after say leaving a parking ramp or garage area, anything under a roof or covering.
The dead reckoning feature is supposed to help keep the map up to date in short distances with a blocked view of the sky, like a tunnel or parking ramp, etc while driving, eventually it goes off course due to tire slippage, etc, a small bit has a large effect over time.
Gilly
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