Navionics has introduced SoanrCharts Shading to the Satellite Overlay on the Platinum+ & HotMaps Platinum charts. Cool feature that can it easier and faster to identify fish holding structure. 2019 Navionics Sonar Charts Shading -004.jpg2019 Navionics Sonar Charts Shading -005.jpg2019 Navionics Sonar Charts Shading -006.jpg