The summer time setting (standard time/summer time) is wrong.

Since the high tide and low tide times and tide levels of the Tide Graph are calculated based on past data, the calculated data may be different from actual tide information.

Also note that the degree of the error can be affected by terrain, weather, and other conditions. Use the tide information of this watch for reference only.

Be sure to check accurate tide forecast information issued by various organizations, and do not use the tide information of this watch to determine tide levels used for navigation or any other purpose where there is the risk of danger.

The alarm’s settings may not be configured. Configure the alarm settings.

The hourly time signal may be disabled. Enable the hourly time signal.

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https://world.casio.com/support/