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Chapter 7
Tides and Currents
Introduction
The ability to determine the height of a tide or velocity of a current is
necessary for the safe navigation of any vessel. There are many
methods of determining this data. The Quartermaster uses the Tide
Tables and Tidal Current Tables that you were introduced to in Chapter
4. In this chapter, you will learn the actual mechanics of determining
tide heights and current velocities.
a. High tide or high water; low tide or low water
b. Range of tide and the duration of rise and fall
c. Stand
Define the terms spring tide and neap tide.
Match the three types of tides listed below with their characteristics:
a. Semidiurnal
b. Diurnal
c. Mixed
Match the following terms associated with tidal reference planes with
their definitions:
a Charted depth
b. Mean high water (MHW)
c. Mean low water (MLW)
d. Mean lower low water (MLLW)
e. Mean range of tide
Objectives
The material in this chapter will enable the student to:
Define the following terms associated with the rising and falling tide
phenomena:
Extract the following information from tables 1 through 3 of the
Tide Tables:
a. Reference station
b. Subordinate station time and height differences
c. Correction factor for height at any time
7-1
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