Google has announced a Google Maps for Mobile update in the Google Mobile Help discussions area that fixes the bugs with version 3.0 for Symbian and Windows Mobile devices.

Googler, Christopher, said:

It seems like early feedback on this release shows that some users of these applications on the devices are still having some issues. If you are having any issues with Google Maps for Mobile on Symbian and Windows Mobile devices this is the place to be.

Forum discussion at Google Mobile Help.