I'm afraid, you wouldn't find this option.
G2Vision maps up to v11.00 (2009) generally weren't usable on handhelds, because of this awful satellite pictures. From v11.50 (2010) Garmin changed the G2V maps, so that the satellite imaginary is deactivatable on Oregon & co. Unfortunately on the new GPSmap 62 and 78 series both parts will be shown as one unit in maps menu, so that you have the same problem as Oregon & co. before! As long as Garmin don't change this by firmware upgrade, you can only use G2 or classic BlueCharts on your device. The horrible satellite images are dangerous for navigation. I nearly set a sailyacht on a rock between west swedish archipelago because I didn't see anything on the map after changing zoom range.