Captain Roy's Marine Training

Navigation General Quiz #2


A tide is called diurnal when _____________.

  A. only one high and one low water occur during a lunar day.
  B. the high tide is higher and the low tide is lower than usual
  C. the high tide and low tide are exactly six hours apart
  D. two high tides occur during a lunar day.


The National Ocean Service publishes the ___________.

  A. Light Lists
  B. Coast Pilots
  C. pilot charts
  D. Sailing Directions


The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which of the following describes the light?

  A. It is visible 10 miles.
  B. Its distinguishing number is "19M".
  C. It has a radar reflector.
  D. None of the above


A safe water mark may be _____________.

  A. vertically striped
  B. spherical
  C. showing a white light
  D. All of the above


According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northwest wind, the center of low pressure is located to the _______.

  A. Northeast
  B. West-southwest
  C. Northwest
  D. South-southeast


When daylight savings time is kept the times of tide and current calculations must be adjusted. One way of doing this is to __________.

  A. Subtract one hour from the times listed under the reference stations
  B. Add one hour to the times listed under the reference stations
  C. Apply no correction, as the times in the reference stations are adjusted for daylight savings time
  D. Add 15 degrees to the standard meridian when calculating the time difference


A wind vane on a moving vessel shows ______________.

  A. Dead reckoning wind direction
  B. True wind direction
  C. Apparent wind direction
  D. Estimated wind direction


A Mercator chart is a _____________.

  A. Cylindrical projection
  B. Simple conic projection
  C. Polyconic projection
  D. Rectangular projection


Magnetic compass deviation _____________.

  A. Varies depending upon the vessel and bearing used
  B. Is the angular difference between magnetic north and compass north
  C. Is published on the compass rose on most nautical charts
  D. Is the angular difference between geographic and magnetic meridians


Buoys which mark isolated dangers are painted with alternating ________ .

  A. Red and black bands
  B. Green and black bands
  C. Red and white stripes
  D. Green and white bands