Inserting a cable onto an ADMIRALTY Standard Nautical Chart

Summary

This instructional video demonstrates the precise process of updating a nautical chart with a new submarine cable. It guides viewers through using a grid box for initial positioning, marking the cable's location with a 7H pencil, and then verifying with a tracing. After ensuring accuracy, a 2B pencil and ruler are used to draw guidelines. The cable is then neatly drawn with a magenta 0.18 pen, avoiding overlap with existing chart details. Finally, all pencil marks are erased, and the tracing is reapplied to confirm the cable's correct placement. The video concludes with updating the chart's Notices to Mariners section.

Takeaways

• 📍 Use the grid box to find the NM position on the chart.
• 📏 Use latitude and longitude guides to place the tracing accurately.
• ✏️ Mark the submarine cable positions with a 7H pencil through the tracing onto the chart.
• 📝 Remove the tracing to reveal the marked positions on the chart.
• 📏 Draw guidelines between marked positions using a 2B pencil and a ruler.
• 🔍 Double-check the guideline positions by placing the tracing back on the chart.
• 🖋️ Draw the submarine cable with a magenta 0.18 pen and a hacksaw blade, ensuring a neat wavy line.
• ❌ Avoid drawing over any existing chart information.
• 🗒️ Erase all pencil markings after completing the cable drawing.
• 🔄 Check the cable's correct position by overlaying the tracing once more.
• 📋 Update the chart with the NM update number in the Notices to Mariners section.

Q & A

What is the purpose of using a grid box in the process described?

The grid box is used to reference the NM (nautical mile) position on the chart, which helps in accurately locating the position of the submarine cable.

Why is a tracing sheet used in this process?

A tracing sheet is used to lay out the exact location of the submarine cable on the chart by using latitude and longitude guides, ensuring precision without directly marking the chart.

What type of pencil is recommended for marking the positions of the submarine cable on the tracing sheet?

A 7H pencil is recommended for marking the positions because it provides a light, precise mark that can be easily erased if needed.

Why is it important to remove the tracing sheet after marking the positions?

Removing the tracing sheet after marking allows you to reveal the chart underneath and use a 2B pencil and ruler to draw guidelines between the marked positions without damaging the tracing sheet.

What is the purpose of relaying the tracing over the chart after drawing guidelines?

Relay the tracing over the chart to check that the guideline positions are correct before proceeding with the final drawing of the submarine cable.

Why is a magenta 0.18 pen used to draw the submarine cable?

A magenta 0.18 pen is used to draw the submarine cable with a neat wavy line because magenta is a color that stands out clearly on charts, and the 0.18 pen size provides a precise line width.

What is the significance of using a hacksaw blade when drawing the cable?

A hacksaw blade is used as a straightedge to ensure that the wavy line representing the submarine cable is drawn straight and neat without deviating from the intended path.

Why is it crucial not to draw over existing chart information?

It is crucial not to draw over existing chart information to maintain the integrity and readability of the chart, as overdrawing can obscure important data and create confusion.

What is the role of an eraser in this process?

An eraser is used to remove all pencil markings after the final drawing is complete, ensuring that the chart remains clean and only the permanent updates are visible.

How does laying the tracing back over the chart help in the process?

Laying the tracing back over the chart helps to verify that the cable has been inserted in the correct position, ensuring accuracy before finalizing the chart updates.

What does updating the NM update number in the chart's Notices to Mariners section signify?

Updating the NM update number signifies that the chart has been revised with the latest information, including the newly added submarine cable, and is current with the most recent maritime updates.

Outlines

00:00

🚀 Submarine Cable Charting Process

This paragraph outlines the step-by-step process for accurately charting a submarine cable on a nautical map. It begins with using a grid box to pinpoint the cable's position on the chart. The latitude and longitude guides are then utilized to lay a tracing paper over the chart, marking the cable's exact location with a 7H pencil. After marking, the tracing paper is removed to reveal the chart, and guidelines are drawn between the marked positions using a 2B pencil and ruler. The tracing is checked for accuracy before proceeding. A magenta 0.18 pen and hacksaw blade are then used to draw the cable with a neat wavy line, ensuring not to overwrite any existing chart information. Pencil markings are erased, and the tracing is reapplied to verify the cable's correct position. Finally, the chart is updated with the NM update number in the Notices to Mariners section.

Keywords

💡Submarine Cable

A submarine cable is an undersea cable laid on the sea bed to transmit telecommunication signals across long distances. In the context of the video, it is the primary subject being demonstrated, with the focus on accurately plotting its position on a nautical chart. The video guides viewers through the process of marking and drawing the submarine cable, ensuring it is represented correctly without overlapping existing chart information.

💡Grid Box

The grid box is a tool used in navigation to reference specific positions on a chart. It helps in pinpointing the exact location of the submarine cable's nautical mile (nm) position. The video uses the grid box as a starting point for the process of plotting the cable's position, highlighting its importance in accurate navigation and charting.

💡Latitude and Longitude

Latitude and longitude are geographical coordinates that specify locations on the Earth's surface. In the video, these coordinates are used in conjunction with the tracing and chart to accurately place the submarine cable. The script mentions using these guides to lay the tracing to its exact location, which is crucial for precise charting and navigation.

💡Tracing

A tracing in this context refers to a template or overlay used to transfer information, such as the position of the submarine cable, onto a nautical chart. The video describes using a tracing to mark the cable's positions, which is then used as a guide for drawing on the chart. It is a tool for ensuring accuracy and alignment when plotting new information onto existing charts.

💡Chart

A chart in navigation is a graphical representation of geographical information, such as oceans, coastlines, and other features, used for planning and executing voyages. The video script refers to a chart as the base onto which the submarine cable's position is marked and drawn. It is the canvas on which all the plotting and drawing activities are performed.

💡7H Pencil

A 7H pencil is a very hard pencil, which is ideal for making light, temporary marks on a chart. In the video, a 7H pencil is used to mark the positions of the submarine cable through the tracing onto the chart. This allows for adjustments to be made without damaging the chart and ensures that the final drawing can be done with precision.

💡2B Pencil

A 2B pencil is softer than a 7H pencil and leaves a darker mark, suitable for drawing guidelines that are more visible and permanent. The script instructs using a 2B pencil and a ruler to draw guidelines between the marked positions of the submarine cable, which will serve as a guide for the final drawing with a pen.

💡Magenta 0.18 Pen

A magenta 0.18 pen is a specific type of pen with a fine tip, used for drawing precise lines. In the video, this pen is used to draw the submarine cable with a neat wavy line, indicating its path under the sea. The choice of color and pen size is important for ensuring the cable is clearly visible and distinguishable on the chart.

💡Hacksaw Blade

A hacksaw blade is a tool typically used for cutting metal but, in this context, it is used as a straight edge to guide the pen while drawing the submarine cable. The video mentions using a hacksaw blade to ensure the wavy line is drawn straight and accurately, which is essential for maintaining the integrity of the chart's information.

💡Eraser

An eraser is a tool used for removing pencil markings. In the video, it is used to clean up any pencil markings after the final drawing of the submarine cable is complete. This step ensures that the chart remains neat and only the permanent, accurate information is visible, which is important for clarity and safety in navigation.

💡Notices to Mariners

Notices to Mariners are publications that provide updates and corrections to nautical charts and publications. The video script instructs adding the nm update number to the chart's Notices to Mariners section, indicating that the chart has been updated with new information. This is a crucial step in maintaining the accuracy and reliability of navigational charts.

Highlights

Demonstrates how to win a new submarine cable

Utilizes grid box to reference the NM position on the chart

Employs latitude and longitude guides on the tracing and chart

Aligns tracing to exact location using a 7H pencil

Marks positions of the submarine cable through the tracing

Removes tracing to reveal the chart

Draws guidelines between marked positions with a 2B pencil and ruler

Checks guide line positions with the tracing overlay

Draws submarine cable with a magenta 0.18 pen and hacksaw blade

Ensures no overlap with existing chart information

Erases all pencil markings after drawing

Checks cable position with tracing overlay

Applies all updates to the chart

Updates the NM update number in the chart's Notices to Mariners section

Ensures accuracy in chart updates

Maintains neatness and precision in drawing the cable

Uses specific tools and techniques for chart updates

Highlights the importance of checking and double-checking chart updates

Transcripts

this example will demonstrate how to win

a new submarine cable 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 using a 7h pencil mark the

positions of the submarine cable through

the tracing onto the chart beneath

remove the tracing to reveal the chart

using a 2b pencil and a ruler draw

guidelines between all the marked

positions at this point relay the

tracing over the chart to check that the

guide line positions are correct before

continuing

then using a magenta 0.18 pen and a

hacksaw blade draw the submarine cable

with a neat wavy line make sure you do

not draw over any existing chart

information once complete use an eraser

to remove all pencil markings

now lay the tracing back over the chart

to check that the cable has been

inserted in the correct position

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

you