A marine chart is a specialized navigational map which helps boaters and seafarers to safely navigate the waters. These charts are essential for those who wish to explore the vastness of the ocean, giving crucial information like water depths and coastal features. The various numbers found on a marine chart are an important part of the navigation process, and are designed to help the navigator make smart and informed decisions on their journey.
Understanding the Numbers
The numbers found on a marine chart provide information about water depths, hazards, and other navigational features. The numbers are usually presented in the form of a chart, which can be divided into two categories: contour numbers and soundings. Contour numbers are used to measure the depth of water at various points around the coastline, while soundings are used to measure the depth of water in the open sea. Both of these forms of measurement are essential for safe navigation.
Contour Numbers
Contour numbers are found on the coastal portions of marine charts, and are used to measure the depths of water around the shoreline. These numbers usually range from 0 to a maximum of 30, with 0 being the shallowest and 30 being the deepest. The numbers on the chart are usually presented as a series of parallel lines, which indicate the depth of water at different points along the coast. This helps the navigator to identify areas of shallow water, deep water, and any potential hazards.
Soundings
Soundings are used to measure the depths of water in the open sea, and are usually found on larger marine charts. These numbers can range from 0 to 200, with 0 being the shallowest and 200 being the deepest. The numbers on the chart are usually presented as a series of concentric circles, which indicate the depth of water at different points in the ocean. This helps the navigator to identify deeper waters, shallow waters, and any potential hazards.
Other Numbers
In addition to contour numbers and soundings, there are also other numbers found on marine charts. These numbers provide information about any potential hazards in the area, such as rocks, shoals, and reefs. The navigator should pay close attention to these numbers, as they can help to prevent any potential accidents. They are also used to identify any navigational aids in the area, such as buoys, lighthouses, and beacons.
Using the Numbers
The numbers found on a marine chart are an essential part of the navigation process, and should be used in combination with other navigational information. The navigator should use the numbers to identify areas of shallow and deep water, potential hazards, and any navigational aids in the area. The navigator should also use the numbers to determine the safest route, and to ensure that they are not putting themselves or their vessel into any danger.
Up-to-Date Charts
It is important that the navigator always uses up-to-date charts, as the numbers found on the chart may have changed over time. Coastal features and hazards can change over time due to storms, erosion, and other factors, so it is important that the navigator uses the most recent information available. This will ensure that they are always using the most up-to-date information for their journey.
Conclusion
The numbers found on a marine chart are an essential part of the navigation process, providing crucial information about water depths, hazards, and other navigational features. Contour numbers are used to measure depths around the shoreline, while soundings are used to measure depths in the open sea. Other numbers provide information about potential hazards, and navigational aids in the area. It is important that the navigator uses up-to-date charts, as the numbers may have changed over time. By using all of the numbers on the chart, the navigator can ensure that they are taking the safest route possible.