Thanks catymag, can you tell me how to merge gmapsupp.img for two or more maps and if posibble how to eliminate maps on my unit?

Right now I have on the gps the CN NAM 2010.30 US Only and the CN Mex 2008.1 merged onto the gmapsupp.img of the unit. I also have the CN NAM NT 2010.20 (Mexico Only) on my SD card but this one is easy to remove.

What I would like to do is to leave the CN NAM 2010.30 that came with the unit on the unit and the CN NAM 2010.30 Complete that you kindly pointed to on the SD...

Your help is greatly appreciated!!!, I'm the newbiest of the newbies!