Question 853Navigation General

The correct answer is D) vector and raster. ECDIS (Electronic Chart Display and Information System) units incorporate both vector and raster digital chart data formats. Vector data represents chart features as mathematical objects (lines, polygons, etc.), while raster data represents the chart as a grid of pixels. ECDIS systems are designed to work with both vector and raster chart data formats to provide mariners with the most comprehensive and accurate navigational information possible. The other options are incorrect because: A) imposed viewing is not a data format, B) raster-only ECDIS systems are outdated and do not provide the full functionality of modern ECDIS, and C) vector-only ECDIS systems would lack the flexibility and visual representation of raster chart data.