OK.
See, I intend to put all my maps in the MS card. Today I have the CN in the nuvi, and the others in card.
I will use TRC, CN 2010.30 and Autoguia only in the card, and I will use WGMap tool to joint all maps in just one.
The question is: I know that I will have to erase CN from the Nuvi. But, should I erase just the .img file or the .unl and .sum too?
Thank you,

Eduardo