I upgraded my Mk iV DVD sat nav April 2003, actually built December 02 I beleive - version 4/1-12 - using Version 28 software and saw no real difference except that I can now access the perspective view and it claims I can have traffic information and does give me the options as to what I would like to see.

For one brief glorious moment it put symbols all over the map showing road works etc. and left me several messages about local road works and then nothing.

I did this as part of a comprehensive upgrade of the maps to include all of Europe was told to expect speed camera data too - but cannot see any.

I now also have the latest version of TIS and the wiring diagrams - but other than the screen now looks more pretty I cannot see any difference.

Upload time took less than 1 minute by the way not the 6 it said it might be.

Last night the DVD froze i the machine and took 3 ejects and reboots to get it back - seems ok now though. Not sure why it did that.