The soundings on the chart are based on the...

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Question 1 of 2066636eea28f7522a1c51b57e

The soundings on the chart are based on the depth of water available at __________.

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Question 1 of 20

66636eea28f7522a1c51b57e

The soundings on the chart are based on the depth of water available at __________.

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🔍 Key Concepts

• Chart datum used for U.S. nautical charts • Difference between mean low water, mean lower low water, and high water datums • Why soundings are usually referenced to a level close to the lowest predicted tide

💭 Think About

• Ask yourself: For safe navigation, should chart depths be measured from a higher water level or from a very low water level? Why? • Which of the listed water levels is typically used as the reference (datum) on U.S. coastal charts so that the mariner usually has at least that much water or more? • Compare "mean low water" and "mean lower low water": which one represents the lower average tide level in areas with two low tides per day?

✅ Before You Answer

• Verify in tide and chart references which level is the standard chart datum for U.S. charts (e.g., NOAA charts). • Make sure the option you pick represents a low-water reference, not a high-water reference. • Confirm that the chosen datum is defined as an average of the lower of the daily low waters over a 19-year period in mixed or semidiurnal tide areas.

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Study

Question 1 of 2066636eea28f7522a1c51b57e

The soundings on the chart are based on the depth of water available at __________.

Back

Question 1 of 20

66636eea28f7522a1c51b57e

The soundings on the chart are based on the depth of water available at __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed