Precautions During Use; Display Information Accuracy; Tide Graph Precautions; Sunrise/Sunset Precautions - Casio WSD-F21HR User Manual

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Note the precautions in this section whenever using this watch.

Precautions During Use

For Japan area oceans, tide times and level changes are predictively

calculated using harmonic constant data obtained from Bibliography 742

Tidal Harmonic Constants Tables, Japanese Coast (February 1992)

published by the Hydrographic Department of the Japan Coast Guard, and

from the List of Tidal Stations (2015) published by the Japan Meteorological

Agency. For other area oceans, tide times and level changes are predictively

calculated using harmonic constant data obtained from NOAA, NOAA CO-

OPS, and the NOAA Tides & Currents website, and the U.S. DEPARTMENT

OF COMMERCE / COAST AND GEODETIC SURVEY January 1942 TH-1.

Actual tidal phenomena fluctuate in accordance with weather, the season,

and various other factors, and may give rise to irregularities not in accordance

with calculated values. Certain conditions may result in some deviation from

actual tides. Because of this, the information produced by the Tide Graph

function of this app and watch should be treated as approximate reference

information only. Never use it for navigation or any other decisions about tide

that may put safety at risk.

Sunrise and sunset calculations are performed using the following azimuths:

North: 0 degrees, East: 90 degrees, South: 180 degrees, West: 270 degrees.

Calculation results include error of multiple seconds, and error becomes

greater at higher latitudes. Calculations assume a level horizon, and local

topography is not taken into consideration.

EN-105

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