Raster Chart Information Introduction
RNC or `Raster` Charts are available and have almost global coverage of all scales as shown above. They provide the obvious advantage of familiar format to the mariner, but also a number of disadvantages.
RNCs are designed to be displayed at the same resolution as that which they are provided. Excessive zooming in or out of the same image seriously degrades the RNC image. RCDS allows charts of appropriate scale to be displayed; when the user wants to zoom in then a larger scale chart will be displayed and similarly on zooming out a smaller scale chart will be used.
Orientation of the RCDS display to other than north-up (e.g. course-up or route-up), may affect the readability of chart text and symbols.
If available on your system, we need to be able to demonstrate how to select RNC charts and utilise their information.
If you have RNC charts installed and available we need to learn how to review their updates.