04:10 3,05 18 10:08 0,77 18 16:23 2,99 18 22:24 0,81 18. Calcular la hora oficial entre la primera pleamar y la primera bajamar del 18 de marzo de 2025, a la que tendremos una sonda de 3,95 metros en un bajo marcado en la carta con una sonda de 1,63 metros. Adelanto vigente: +1 hora.04:10 3.05 18 10:08 0.77 18 16:23 2.99 18 22:24 0.81 18. Calculate the official time between the first high water and the first low water of 18 March 2025 at which we will have a sounding of 3.95 metres on a shoal charted at 1.63 metres. Clock advance: +1 hour.

Correct answer: b) 07:27

Why it is correct

You need h = 3.95 − 1.63 = 2.32 m. Between 04:10 (3.05) and 10:08 (0.77) that comes at 06:27 UTC, which is 07:27 official time.

Why the others are not

• a) It does not match the working.
• c) It does not match the working.
• d) It does not match the working.

How to work it out in the exam

1. Height needed = sounding asked for − charted sounding.
2. Solve the height formula for t, and add it to the first tide time.
3. Go from UTC to official time by adding the clock advance.

Where this question comes from

• Junta de Andalucía · 2025 · 1ª convocatoria · PY Módulo de navegación · question 18 Official paper · Official answer key

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