Anyone know how Garmin work out the version of G2 Vision products.

I'm a bit confused, I have V10.5 VEU706L for my plotter,which I believe is the version just before the Garmin Recall of their G2 Vision charts, but I want to upgrade to the latest version.

There seems to be a version V11.5, but there also seems to be versions labled 2008, 2009 & 2010.

I have the oppertunity of getting a 2010 version on eBay, but I want to make sure its the latest.

Can anyone tell me the differance between Garmin Bluechart G2 Vision V11.5 and 2010, or, at least how do the 2 versions relate to each other?

Thnx