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Arriban a Barbate y tras hacer el despacho de llegada en la Marina a HRB 1230, les asignan atraque con sonda de carta= 2 metros, siendo el calado del yate= 1,50 metros, y obtienen del Anuario de Mareas para el año en curso los siguientes datos:  Altura de la bajamar más próxima= 0,37 metros.  Corrección aditiva por intervalo horario de llegada= 1,20 metros. Calculan la sonda bajo quilla en ese instante:They arrive at Barbate and after clearing in at the Marina at ship’s clock 1230 are given a berth with a charted sounding = 2 metres, the yacht’s draught being 1.50 metres, and obtain from the current Tide Tables: nearest low water height = 0.37 metres; additive correction for the arrival time interval = 1.20 metres. They work out the water under the keel at that moment:

Show the answer

Correct answer: a) 2.07 metres

Why it is correct

2 + 0.37 + 1.20 − 1.50 = 2.07 m.

Why the others are not

  • b) The result is different.
  • c) The result is different.
  • d) The result is different.

How to work it out in the exam

  1. Water under the keel = charted sounding + height of tide − draught.
  2. The height of tide is the low water plus the additive correction from the Anuario.

Where this question comes from

Try it: Tide trainer

Pending instructor review. Machine translation, not reviewed.