Tide problems, Question 56, 1 Kyu

Tides, in a simplified form, are the rise and fall of the ocean’s surface level as a result of the

gravitational pull of the moon, earth, and sun. Tides are vertical. Tidal currents, again

simplified, are the horizontal movement of water from one point to another as a result of

differences in tidal heights at those points (Chapman).

Remember: Tides are vertical, currents are horizontal.

Daily Tide Predictions

Tide Reference Stations around the coastline are major stations where the government posts

daily tide information. The government also maintains ‘Subordinate Stations’ but the

information provided at these stations are data by which a client can estimate the actual data

based on simple corrections to a nearby Reference Station. Half of the questions in the pool for

item 56 center on making these corrections and determining the correctness of statements

based on those calculations.

Daily Current Predictions

These tables gives the predicted times of slack water and the predicted times and speeds of

maximum current, both flood and ebb at a reference station. Also listed at the top of the table is

the direction of set towards which the current flows.

Half of the questions in the pool for item 56 will be on tidal current charts and they follow a

similar format. The examinee will be given a chart and asked to find the incorrect statement

among four possibilities as follows:

The time when the westerly (or other appropriate direction) current becomes strongest

at a certain time.

The time when the easterly (or other appropriate opposite direction) current becomes

strongest at a certain time.

The time when the current changes from one direction to another

The time period for a directional current in the morning

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