OK, Having looked at Navionics web site, it appears my options are Navionics Gold or Platinum+. The Gold version appears to be the basic nautical chart, the Platinum+ version has everything the Gold has plus satellite photos, 3D depth info, "sonar chart" 2-D depth contours, and "fish-n-chips" fishing spot information.
Has anyone used the extra Platinum+ features? Do they all work on a 1197? Are these features useful?
One last thing, How do you activate these features on a 1197 (i.e how do you turn them on or display them)?