December Marine Navigation Memorization PDF

For December must memorize 1.) What is Compass Error? Ans: The Difference between Compass Heading and True Heading *Variation- The difference between True North and Magnetic North * Deviation- A measurement of difference observed value of a variable and some other Variable 2.) 32 Boxing the Compas...

For December must memorize 1.) What is Compass Error? Ans: The Difference between Compass Heading and True Heading *Variation- The difference between True North and Magnetic North * Deviation- A measurement of difference observed value of a variable and some other Variable 2.) 32 Boxing the Compass Ans: N, NxE, NNE, NExN/ NE, NExE, ENE, ExN/E, ExS, ESE, SExE/ SE, SExS, SSE, SxE/ S, SxW, SSW, SWxS/ SW, SWxW, WSW, WxS/ W, WxN, WNW, NWxW/ NW, NWxN, NNW, NxW 3.) Name 2 Main chart use for Navigation Ans: 1. Mercator chart and 2. sailing chart (Mercator & Gnomonic Projection) 4.) Rumbline and Great Circle Ans: 1. Rumbline- is an arc crossing all meridians of longitude at the same angle 2. Great Circle- sailing is the practice of navigation a vessel along a great circle 5.) What is Prime Meridian Ans: is an arbitary meridian in a geographic coordinate system at which longitude is defined to be 0⁰. 6.) What is the use of Sixtant Ans: an instrument for determining the angle between the horizon and a celestial body such as the sun, the moon, or a star, used celestial navigation to determine, latitude and longitude. 7.) What is the maximum Angle measurement available on Sixtant Ans: 120⁰ 8.)How many methods are there for position fixing Ans: there are four(4) methods; 1. The visual Bearing 2. Radar Fixes 3. Tettestrial and Celestial observation 4. GPS fixes 9.) Navigation Lights display by a Pilot Vessel while underway Ans: near the masthead, two all-round lights in a vertical line, the upper being white and the lower red in addition, sidelights and a sternlight 10.) Lights Display by a Vessel Not Under Command and what Fog Signal is used by such Vessel Ans: two all-round red lights in a vertical line where they can best be seen, sound at interval of not more than 2 minutes Three Blast in succession namely One Prolonged Followed by Two Short Blast 11.) What is the signal used by a power driven Vessel while in area of Restricted Visibility Ans: A power-driven vessel making way through the water shall sound, at intervals of not more than 2 minutes, one prolonged blast. 12.) Define Navigation. Ans: is an act or process of moving a vessel from one point to another 13.) How do you define Tide Ans: The alternate of rising and falling of Seas 14.) Define the prevailing moonsonal season Ans: the north-east and southeast moonsoon 15.) What is the primary cause of ocean current and waves Ans: Wind 16.) Example of Radar Observation that danger of Collision deemed to exist Ans: Taking compass Bearing is one of the most important means of Determining risk of collision 17.) Describe the Territorial Sea Ans: is a Belt of Coastal Waters extending at most 12 Nautical Miles from the baseline of a coastal State 18.)How do you describe a vessel on an even keel Ans: when the draft of the vessel fore and aft is equal 19.) What is an indication of initial stability Ans: GM (METACENTER HEIGHT) 20.)the Change of weight which cause a change in draft of one inch Ans: TPC or Tons per Centimeter 21.) What is the minimum oxygen percentage require to enter an enclosed space Ans: 23.5%/ 19.5% (20%) 22.) What is EEBD Ans: an Emergency Escape Breathing Device is life saving Aplliance w/c is used for escaping an area w/ hazardous conditions such as fire, smoke, poisonous gases etc. 23.) Can you used EEBD for fire fighting Ans: NO 24.) Atmospheric pressure increases or decreases w/ height Ans: Pressure Decrease w/ Increasing Altitude. If the altitude increases the pressure will be decrease 25.) What is hygrometer Ans: an instrument used in meteorological science to measure the humidity or amount of water vapour in the air 26.) What is Humidity Ans: is the concentration of water vapour present in the air 27.) What is hydrometer Ans: is an intrument used for measuring density or relative density of liquids base on the concepts of bouyancy 28.) What is the density of sea water Ans: 1023.6 kg/m³ 29.) If the density of water increases wether the vessel will sink more or rise Ans: if the density of salt water is higher than that of fresh water , less salt water will be displaced and the ship will float higher 30.) what is the used of windlass Ans: is let out and heave up equipment such as a ships anchor or fish trawl 31.) What is Archimedes principle Ans: A body Immersed In a fluid Subjected To an upwards Force Equal to the weight Of the displaced fluid 32.) What is flashpoint Ans: the minimum temperature at which a liquid gives off vapor within a test vessel in sufficient concentration to form an ignatable mixture with the air near the surface of the liquid 33.) What is boiling point? What is boiling of water? Ans: the temperature at which its vapor pressure Is equal To the pressure of the gas above (100%) 34.) Why does rust formation takes place on a ship hull Ans: due to oxidation and saltwater 35.) What do you understand by term ism Ans: the international safety management code governs the safe operation of ships and pollution prevention 36.) How many Beaufort scale are there for wind and sea Ans: Wind -12 & Sea -9 37.) If you compress an air pocket will the temperature rise or fall Ans: if i compress the hair pocket the temperature will rise 38.) What is freshwater allowance Ans:) the number of inches by which the mean draft changes when a ship passes from salt water to freshwater or vice versa when the ship is loaded to the summer displacement 39.) On a head on Situation What is the Proper Action In order to avoid Collision Ans: alter her course to starboard so that each shall pass on the port side of the other 40.) What do you mean by stand on vessel Ans: the vessel that must maintain its course and speed unless it becomes apparent that the giveaway vessel is not taking appropriate action