What type of data does a Raster Chart represent?

A Raster Chart represents a digitalized picture of a chart. This format is created by scanning a traditional paper nautical chart and converting it into a digital format. As a result, raster charts contain a pixel-based (bitmap) representation of the original chart, which can include depth contours, navigational aids, and other important information. Users can seamlessly view this digital version on electronic devices, such as GPS navigation systems and chart plotters.

In the context of navigation, raster charts maintain the visual elements and symbols found in paper charts, thus providing familiar references for mariners. This characteristic is particularly useful for navigation and seamanship, as it allows users to interpret visual information quickly and effectively.

While organized numerical data, real-time sensor data, and interactive layered data refer to other types of chart formats or data representations, they do not apply to raster charts. Organized numerical data is typically associated with vector charts, which utilize mathematical representations of chart elements. Real-time sensor data involves inputs from navigation sensors and devices that provide ongoing updates about the vessel's environment. Interactive layered data also pertains more to vector charts, which enable users to manipulate layers (e.g., weather, tides) for refined navigation planning.