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Puerto de Cádiz. Información del Anuario de Mareas para el 7 de junio de 2016: Hora Alt 03:48 3,34 09:44 0,56 16:08 3,47 22:19 0,47 Calcular la hora oficial entre la primera bajamar y la segunda pleamar del 7 de junio de 2016, en la que tendremos como mínimo una sonda de 2,8 metros, en un bajo marcado en la carta con una sonda de 1,7 metros. Adelanto vigente: +2 horas.Port of Cádiz. Tide Tables for 7 June 2016: Time Height 03:48 3.34 09:44 0.56 16:08 3.47 22:19 0.47. Calculate the official time between the first low water and the second high water of 7 June 2016 at which we will have at least a sounding of 2.8 metres, on a shoal charted at 1.7 metres. Clock advance: +2 hours.
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Correct answer: c) 13:33
Why it is correct
You need h = 2.8 − 1.7 = 1.10 m. Between 09:44 (0.56) and 16:08 (3.47) that comes at 11:33 UTC, which is 13:33 official time.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- d) That is the UTC time, without the clock advance.
How to work it out in the exam
- Height needed = sounding asked for − charted sounding.
- Solve the height formula for t, and add it to the first tide time.
- Go from UTC to official time by adding the clock advance.
Where this question comes from
- Junta de Andalucía · 2016 · 2ª convocatoria · PY Módulo de navegación · question 18 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.