prelim 2 Flashcards
(37 cards)
play a crucial role in maritime navigation, helping mariners locate the correct nautical charts and publications they need for safe and efficient voyage planning. These catalogues are published and maintained by the United Kingdom Hydrographic Office (UKHO).
Introduction to Admiralty Chart Catalogues
The primary goal of these catalogues is to assist sailors in identifying and selecting the appropriate charts and publications for their voyage. They provide updated and detailed information about available nautical charts, including their coverage, scale, and reference numbers.
Purpose of Admiralty Chart Catalogues
Admiralty Chart Catalogues are updated periodically to reflect changes in navigation conditions, new surveys, and corrections. These updates ensure that mariners have the most accurate and reliable information available.
Updates and Maintenance
To efficiently locate the necessary chart, each chart is assigned a unique number that helps mariners quickly identify and reference them.
How to Find the Right Charts
The chart index is a critical component of the catalogue, listing all available charts along with their details.
Understanding the Chart Index
Every chart has a title that describes the geographical area it covers, allowing mariners to select the correct chart for their route.
Chart Titles and Their Importance
Aside from charts, the Admiralty Chart Catalogue also includes a Catalogue of Nautical Publications, which contains essential navigation guides, sailing directions, and other reference materials for mariners.
Nautical Publications in the Catalogue
provide detailed information about coastlines, ports, harbors, tides, and local navigation hazards. These are crucial for safe passage planning.
Sailing Directions and Their Use
Charts use scales to help sailors determine distances accurately. The scale represents the ratio between charted distances and actual distances on the Earth’s surface.
Measuring Distances on Charts
assist in electronic navigation, ensuring ships can determine their position using radio signals from lighthouses, satellites, and coastal stations.
Radio Navigational Aids
The catalogue is divided into multiple sections, each covering a specific region of the world.
Structure of the Admiralty Chart Catalogue
have been traditionally used for navigation. They offer detailed information about water depths, underwater hazards, navigational aids, and coastline features, ensuring safe passage for vessels.
Paper Nautical Charts
are digital versions of traditional charts used with Electronic Chart Display and Information Systems (ECDIS). Unlike paper charts, ENCs provide real-time navigation data and interactive features.
Electronic Navigational Charts (ENCs)
Types of nautical chart
- Harbor Charts
- Sailing Charts
- General Chart
- Coastal Chart
- Small scale vs Large scale Chart
Large-scale charts that provide detailed navigation information for ports and confined waterways.
Harbor Charts
Used for nearshore navigation, offering detailed information about coastlines, buoys, and hazards.
Sailing Charts
Designed for long-distance voyage planning, covering extensive ocean areas with less detail.
General Charts
Cover large ocean areas but provide minimal detail, suitable for coastal navigation.
Coastal Charts
Small-scale charts cover larger geographic areas but with less detail, whereas large-scale charts provide more detail for a smaller area.
Small-Scale vs. Large-Scale Charts
Specialized Charts
- Tide and Current chart
- ice chart
- Pilot chart
Provide information on tidal ranges, current speeds, and directions, essential for understanding water movement and planning vessel operations accordingly.
Tide and Current Charts
What are the 2 digital format
- Raster Chart
- Vector Chart
Digital images of paper charts, displaying fixed data without interactive features.
Raster Chart
Store navigational data in layers, allowing for customization, zooming, and real-time updates.
Vector Charts
