Typically BMW release 2 versions of each mapping disk per year. We're probably on 2010-2 at present.

The DVD version (for the MkIV - widescreen nav) is about £200 but BMW were doing a deal where if you took your old disk in, they gave you a new one for £100. If your system is still running a 2006 map disk, then you probably need an upgrade to the firmware too. That is easy to do yourself and there are lots of guides and hints in the forum on Navigation Systems.

If you are doing a firmware upgrade it is absolutely crucial that you print and follow the instructions to the letter as failing to do it right can 'brick' the Nav Computer in the boot.

I've upgraded mine and that on our E46 several times with no issues at all. Just follow the guides...

I've never been able to get a copy disc to work either (I tried it using my own legit copy as the source to generate a backup disc) so I have always used the OEM versions.

__________________
Me:
Current: 2011 E71 40D Vermilion Red/Beige Nappa

Wifey:
Current: 2012 R80 Countryman SDX Green/Cream