Nautical Charts Notes
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1
2Nautical Chart Notes
Integrated Science 1
Name:
Date:
Per:
I. Purpose of Nautical Charts
•
Nautical charts are different from maps in that they specifically depict __________________,
while maps concentrate on __________________, roads, landmarks, etc.
•
Land areas and features on charts are sketchy and are noted only for their _________ to the boater.
•
Unlike maps, the nautical chart conveys much information specifically designed to assist in
____________ ___________________ the area that the chart covers
II. How to use a nautical chart for a boating trip
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Study your chart thoroughly.
•
Look at the position from which you will start and visually follow along the course you wish to
take.
•
Look for "notes" - _____________ _____________, obstructions (especially under water),
bridges, power lines or any other unusual items that may be a _______________ to your progress.
•
Look for visual objects featured on your chart that you should be able to
________________________________ to confirm your ______________________.
Label this compass rose:
III. Reading a Nautical Chart
A. Look for the ________________________ at the top right of the chart.
B. __________________ is located at the top of the chart.
• True North is the point around which the ______________________.
• Magnetic North moves over time. For the SF Bay, it is currently about _____________________.
C. Soundings are in meters, feet, or fathoms (__ _______ per 1 fathom)
• Sounding Numbers reflect the ___________ of the water
• Map Colors - shallow water is tinted a darker blue and deeper water is a lighter blue and white.
• Depths of water are the ______________ depth for that area.
• Water depth can be affected by the ______________, _______________, ____________, and
_______________________ and _________________.
D. Other Symbols
•
There are 39 different types of ______________ for the ocean floor.
•
If an area’s bottom is known it will be displayed on the chart – M = _________
•
Draw the symbol for an Aid to Navigation (ATON):
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