They run a new transducer that has Hi-Def. software. I believe this is correct. You can check thier website and in say (not accurate info. just an example) 2006 Grenada was a regular map with general contour lines. In 2008 they scanned it again and now it's available in Hi-Def maps that have 1ft. contour lines. Better maps in the long run.

The Hound