Question 904Navigation General

The correct answer is A) a digitized "picture" of a chart in one format and one layer. Raster-scan chart data represents a digital image of a nautical chart, where the chart information is stored as a grid of pixels or color values, similar to a digital photograph. This format captures the chart data as a single, unified layer, unlike vector data which is organized into separate, scalable layers. Raster data is generally larger in file size compared to vector data, but it is a widely recognized format for electronic chart display and information systems (ECDIS). The other answer choices are incorrect because: B) Raster files are not necessarily smaller than vector files, and can be quite large depending on the resolution; C) Raster data is typically organized into a single file, not multiple separate files; and D) Raster data is recognized by the IMO/IHO, but it is not the only format accepted for electronic navigation.