Final answer:
ECDIS units use both vector and raster Digital Chart Data Formats. Vector charts consist of scalable features, whereas raster charts are pixel-based images of scanned maps.
Step-by-step explanation:
ECDIS units incorporate Digital Chart Data Formats, which include vector and raster formats. Electronic Chart Display and Information System (ECDIS) is a computer-based navigation information system that complies with International Maritime Organization (IMO) regulations and can be used as an alternative to paper nautical charts. An ECDIS system displays the information from electronic navigational charts (ENC) and integrates position information from the Global Positioning System (GPS) and other navigational sensors. It also may display additional navigation-related information.
Vector charts are composed of individual chart features represented by points, lines, and polygons, which can be layered and provide a high level of detail and scalability. Meanwhile, raster charts are digital images of paper charts, essentially a pixel-based representation of a scanned map. Both chart types have their own advantages depending on the use case or preference.
Therefore, the correct answer to the question 'ECDIS units incorporate Digital Chart Data Formats, which include________.' is A) vector and raster.