Before starting to practice in order to improve his ability to estimate his ship’s speed with accuracy, an inexperienced shiphandler studied the methods available by which the mariner can judge speed. During the study, he made a list with the following notes:

I. Doppler speed indicator showing lateral motion as well as ahead and stern speed is a valuable shiphandling tool, especially when moving larger ships where speed is critical and tolerance for error small.

II. fixes by radar or visual bearings are convenient and sufficiently accurate for determining speed in a docking situation.

III. even at night is better to estimate ship’s speed looking at objects abeam or little abaft than looking objects ahead of the ships.

IV. if the ship’s quickwater falls behind the ship when the engine is put astern, the vessel’s speed is 3 knots or more.

According to MacElrevey & MacElrevey, in the book “Shiphandler for the Mariner”, what is the correct alternative?

De acordo com o livro “Navegação: A Ciência e a Arte”, de A. P. Miguens, ao se preparar para uma passagem por águas restritas, onde irá empregar a navegação paralela indexada, o navegador, usando um compasso, compara fisicamente a distância entre os anéis de distância da repetidora do radar em cada escala a ser utilizada. Por meio desse procedimento, o navegador busca, naquela repetidora:

In a single propeller ship going ahead, with a right-hand screw, as a blade moves downward it meets water which is moving upward as well as aft. This is equivalent to _________________ the relative velocity and the angle of attack at same time and thus, _________________ in thrust is experienced. On the opposite side, a ______________ in thrust is experienced. The net effect of the reaction to the inclined flow, then, is a _________________ tending to _____________the ship to the _____________.

According to R. S. Crenshaw, Jr., in the book “Naval Shiphandling”, which answer best fill in the blanks?

Uma embarcação naufraga próximo à margem do canal de acesso ao porto, passando a constituir um novo perigo à navegação naquela área. Assinale a opção correta no que diz respeito à sinalização deste novo perigo:

According to the book “Principles of Naval Arquitecture” (PNA), the cavitations forms on marine propellers are mainly:

Taking into account that the vessels described below carry all the lights prescribed by the rules of COLREG, which of the following alternatives is the correct answer?

De acordo com o livro “Principles of Naval Arquitecture” (PNA), a maioria dos navios mercantes tem diâmetro de guinada (turning diameter) com leme totalmente carregado:

Handling a dead ship to make a broadside narrow berthing, the pilot placed two tugs on the port side of the ship, one at the bow, other at the stern. The tugs secured themselves firmly to the ship with one of “tie-ups” described in the book “Naval Shiphandling”, by R. S. Crenshaw Jr. With this arrangement, the direction of the applied force can be altered over a wide range by simply shifting the tug’s rudder.
According to the referred book, which tie-up should be applied by the tugs?

Aboçar uma espia, o tirador de uma talha ou, de modo geral, qualquer cabo, é uma técnica, ou recurso, de uso muito comum a bordo, sendo empregado:

When a tug is slowly overtaking a bulk carrier and approach the stern from behind, it experience a(n) ________________ of speed due to the ________________. When coming nearly abeam of the stern the tug is ________________ the ship, caused by ________________.
Since the tug’s forepart is closer to the ship than the stern, the tug experiences a ________________ turning moment. As soon as the tug moves further forward and parallel with the ship’s hull, it experience a sudden ________________ turning moment caused by ________________.

According to Capt. Henk Hensen, in the book “Tug Use in Port”, which answer best fill in the blanks?