Well seem I got it all working. I was loading a 2015.30 lower 49 map to 4 gig cards even though the map is 1.55 gb. I then tried 2 gig cards and not maps work in the 760 and the 360 garmin.
I never thought that the 4 gig car would cause this as the file on it was only 1.55gb.

My next question is how and if, can a load a 2015.30 map that is 2.3gb to my garmin 760 if possible I tried a 4 gig card and every time i inserted the sd card with map it would corrupt the file, as I would read in gmaptools and showed errors.
Garmin 760 shows latest update webudater
Again to all the thanks to all for helping and answering my questions.