naval chart
Học thuậtThân thiện
Definition
Noun: A specialized map used by mariners for navigation at sea. It depicts maritime conditions, including water depths (bathymetry), coastline features, navigational hazards, aids to navigation (like buoys and lighthouses), and often information about tides, currents, and other hydrographic data.
Usage
A naval chart is an essential tool for planning and executing a safe voyage. It is used to plot courses, identify positions, and avoid dangers.
Examples: * The captain consulted the naval chart to plot a course around the reef. * Modern electronic naval charts are integrated into shipboard GPS systems. * Updating naval charts is critical as sandbars and channels can shift.
Advanced Usage
- "To chart a course": While using a chart for planning, this phrase often implies strategic planning beyond mere navigation.
- The new CEO charted a course for the company's future.
- The term implies official or authoritative mapping, often produced by national hydrographic offices (e.g., Admiralty charts, NOAA charts).
Variants and Related Words
- Nautical chart: A more general term synonymous with "naval chart."
- Hydrographic chart: Emphasizes the scientific surveying of physical seafloor conditions.
- Pilot chart: A type of nautical chart that shows long-term averages of oceanographic and meteorological conditions (e.g., prevailing winds, currents) for route planning.
Synonyms
- Nautical map
- Marine chart
- Sea chart
Antonyms
- Topographic map (a map detailing land terrain)
- Road map
Related Phrases
- Chart table: The dedicated, often illuminated table on a ship's bridge where the physical chart is spread out for use.
- Chart datum: The reference level (e.g., mean lower low water) from which depths and drying heights are measured on the chart.
Noun
- a chart for a navigator showing the prevailing meteorological and hydrographic and navigational conditions