This document introduces electronic chart systems, describing raster navigation charts (RNCs), electronic navigation charts (ENCs), and their advantages and disadvantages. RNCs are produced by scanning paper charts, while ENCs assign digital values to chart points, enabling interrogation of intelligent data. ENCs allow customized displays by layer, showing more detail like soundings when zoomed in, while RNCs cannot be manipulated and may appear cluttered when over-zoomed. Overall, the document provides an overview of electronic chart types and considerations for training purposes.