I used to have a c330 - but I could only have it read NEW maps if I loaded them on a sD card. if you insist on loading it with 2012 maps, you will have to limit the map size thru mapsource to fit on your SD card because maps newer than 2008 have to much info in them and so you can't hope to use entire file (map) or so I recall reading.

Also, once you've created the map image - you will have to use an older utility like UPDATER to install it on the c330. I BELIEVE I read that article (ages ago) on another website, probably GPSpassion or ************** - both in the States. Do a Google search for c330 & "updating internal map". Quotes will be necessary to weed out other articles and advertisements.