Amending the range of a light onto an ADMIRALTY Standard Nautical Chart

Summary

This instructional video demonstrates the process of amending the range of a light on a nautical chart. It begins by referencing the grid box to locate the position on the chart. Using latitude and longitude guides, the tracing is aligned with the chart. The video then instructs viewers to compare the tracing with the chart to identify range changes, such as replacing '7m' with '3m'. It details the use of a magenta 0.18 pen and ruler to strike through the old range and write the new one clearly. The final step involves checking the accuracy of the amendment and updating the chart's Notices to Mariners section.

Takeaways

• 📍 Use the grid box to reference the nautical mile (nm) position on the chart.
• 🔍 Utilize latitude and longitude guides on the tracing and chart to align the tracing accurately.
• ✏️ Compare the tracing with the chart to identify which range needs amendment.
• 🔺 In the given example, the position at Lu on the nm remains the same, but the range needs updating from 7m to 3m.
• 🖊️ Use a magenta 0.18 pen and a ruler to delete the existing range with a double strikethrough.
• ✍️ Write the new range clearly and adjacent to the deleted information, ensuring upper and lower case distinction.
• 🔎 After amending, overlay the tracing back on the chart to verify the correct range was updated.
• 📝 Once all updates are applied, increment the chart's update number in the Notices to Mariners section.
• 📊 Ensure that the chart's Notices to Mariners section is located at the bottom left corner for easy reference.

Q & A

What is the purpose of using the grid box in the example?

The grid box is used to reference the nautical mile (nm) position on the chart.

How do you determine the exact location on the chart?

By using the latitude and longitude guides on the tracing and the chart, you lay the tracing to its exact location.

What is the difference between the original and the amended range in the example?

In the example, the original range is 7nm, which needs to be replaced by 3nm.

What tools are recommended for amending the range on the chart?

A magenta 0.18 pen and a ruler are recommended for amending the range.

How should you delete the existing range on the chart?

The existing range should be deleted with a double strikethrough using the magenta pen.

What is the importance of writing clearly when amending the chart?

Writing clearly helps to distinguish between upper and lower case letters, ensuring the amended information is easily readable and understood.

How do you verify that the correct range was amended on the chart?

By laying the tracing back over the chart and checking that the amended range aligns correctly.

What section of the chart should be updated with the new nm information?

The nm update number should be added to the chart's Notices to Mariners section, located in the bottom left corner.

Why is it necessary to compare the tracing with the chart before amending?

Comparing the tracing with the chart helps to determine which range needs to be amended, ensuring accuracy in the update.

What is the significance of the Notices to Mariners section in a chart?

The Notices to Mariners section is significant as it provides updates and corrections to the chart, ensuring that it reflects the most current information for navigational safety.

Outlines

00:00

📍 Navigating Light Range Adjustments

This instructional video segment guides viewers through the process of amending the range of a light on a nautical chart. It begins with the use of a grid box to reference the position on the chart, specifically the latitude and longitude. The viewer is instructed to overlay a tracing on the chart to match its exact location. The next step involves comparing the tracing with the chart to identify which range needs adjustment. In the example provided, the position remains unchanged, but the range '7m' is to be replaced with '3m'. The video demonstrates how to use a magenta 0.18 pen and a ruler to strike through the existing range and write the new range adjacent to it, emphasizing clear handwriting and proper case distinction. The final step is to verify the amendment by overlaying the tracing back onto the chart and confirming the correct range has been updated. The video concludes with the instruction to record the update in the chart's 'Notices to Mariners' section, located in the bottom left corner.

Keywords

💡Amend

To amend means to make changes or corrections to something, typically to improve it. In the context of the video, 'amend' is used to describe the process of updating the range of a light on a nautical chart. The video script mentions, '...amend the range of a light,' which refers to the action of altering the existing information to reflect new or corrected data.

💡Grid Box

A grid box is a tool used for referencing specific locations on a chart or map. It is typically a square or rectangular area that helps in pinpointing coordinates. In the video, the grid box is used to reference the 'nm position on the chart,' which is crucial for accurately locating and amending the range of the light.

💡Latitude and Longitude

Latitude and longitude are geographical coordinates that specify locations on the Earth's surface. Latitude is the angular distance north or south of the equator, while longitude is the angular distance east or west of the prime meridian. The script mentions using these guides to 'lay the tracing to its exact location,' indicating that they are fundamental in aligning the tracing with the correct position on the chart.

💡Tracing

In the context of the video, a tracing refers to a copy or overlay of a chart feature, such as the range of a light, which is used to make amendments. The script instructs to 'lay the tracing to its exact location' on the chart, suggesting that tracings are used as a template to ensure that changes are made accurately.

💡Chart

A chart in this context is a nautical chart, a specialized map used for navigation that shows features like coastlines, water depths, and navigational aids. The video's theme revolves around amending information on such a chart, as indicated by the phrase '...lay the tracing to its exact location on the chart.'

💡Range

In the context of the video, 'range' refers to the distance over which a light or other navigational aid can be seen. The script specifies that 'the range 7m is to be replaced by 3m,' which means updating the visibility distance of the light from 7 nautical miles to 3 nautical miles.

💡Magenta 0.18 Pen

A magenta 0.18 pen is a specific type of pen used for its color and fine tip, which is suitable for detailed work like amending charts. The video script instructs to 'using a magenta 0.18 pen and a ruler, delete the existing range,' highlighting the importance of precision tools in the amendment process.

💡Double Strikethrough

A double strikethrough is a method of crossing out text twice to indicate that it is no longer valid or to be replaced. In the video, 'delete the existing range with a double strikethrough' refers to the technique used to invalidate the old range information before writing the new one.

💡Upper and Lower Case

Upper and lower case refer to the different forms of letters in written language, where upper case letters are typically larger and used for the beginning of sentences or proper nouns. The script advises to 'distinguish between upper and lower case,' which is important for clarity and to avoid confusion when amending chart information.

💡Notices to Mariners

Notices to Mariners are official publications that provide updates and corrections to nautical charts and publications. The video script mentions updating the 'Notices to Mariners section' after making amendments, indicating that these notices are where changes to charts are officially recorded and communicated to mariners.

Highlights

Demonstrates how to amend the range of a light using a chart.

Uses the grid box to reference the nm position on the chart.

Utilizes latitude and longitude guides on the tracing and chart.

Aligns the tracing to its exact location on the chart.

Compares the tracing with the chart to determine necessary amendments.

Identifies that only the range needs to be amended, not the position.

Replaces the range 7m with 3m as an example of amendment.

Instructs to use a magenta 0.18 pen and a ruler for amendments.

Deletes existing range with a double strikethrough.

Writes the new range adjacent to the deleted information.

Emphasizes clear writing and distinction between upper and lower case.

Lays the tracing back over the chart to check the amended range.

Ensures the correct range has been amended.

Updates the nm number in the chart's Notices to Mariners section.

Highlights the importance of accuracy in chart amendments.

Provides a methodical approach to updating nautical charts.

Stresses the need for precision and clarity in chart annotations.

Transcripts

this example will demonstrate how to

amend the range of a light

start by using the grid box to reference

the nm position on the chart then using

the latitude and longitude guides on the

tracing and the chart lay the tracing to

its exact location

compare the tracing with the chart and

determine which range needs to be

amended in this example in Lu on the nm

indicates that the position remains the

same only the range 7m is to be replaced

by 3m

using a magenta 0.18 pen and a ruler

delete the existing range with a double

strikethrough then write the new range

adjacent to the deleted information

write clearly and distinguish between

upper and lower case now lay the tracing

back over the chart and check that the

correct range was amended

once all the updates have been applied

as the nm update number to the charts

notices to Mariners section in the

bottom left corner of the chart