Not for sale as a separate product, Silver is specifically designed to be preloaded in select chart plotters to provide out-of-the-box usability with an enhanced basemap.
Silver includes coastlines, drying lines, all navigation aids, depth information up to 10 meters (30 ft), plus other information as recommended by international standards for safe navigation with a simplified, uncluttered chart.

Silver charts do not support Freshest Data and UGC, but any system using Silver can accept Gold or Platinum+ products