What is the importance of using Mercator sailing in calculating for course and distance?
Charts used on board ships generally are Mercator charts. On these charts bearings, courses and distances can be directly read off or plotted on the charts. For calculating course and distance between two given points on surface of the earth, the Mercator sailing formula is more accurate than plane sailing formula.
What are the two categories of Mercator sailing?
In broad terms, there are two main types of sailing, namely, the Rhumb Line sailing and the Great Circle sailing.
What is the difference between plane sailing and Mercator sailing?
* It is similar to plane sailing except that plane sailing is used for small distance. * In mercator sailing the d’lat is expressed in longitudinal units, which is the difference of meridianal parts. * In plane sailing the d’long is expressed in latitude units or Nautical miles.
What is a Mercator chart how was it made?
(mər-kā′tər) A method of making a flat map of the Earth’s surface so that the meridians and parallels appear as straight lines that cross at right angles. In a Mercator projection, the areas farther from the equator appear larger, making the polar regions greatly distorted.
What are meridional parts?
: the linear length of one minute of longitude on a Mercator chart.
What are the limitations of a Mercator sailing?
Disadvantages of Mercator’s projection: – Mercator’s projection does not preserve lengths or areas further from the equator – the smallest distance on the globe is not realized by a straight line on the map – not suitable for teaching geography and in political maps (this projection distorts areas and sizes of states …
What is the importance of using Mercator sailing?
Mercator sailing is used to calculate the position after sailing along a rhumb line other than in a North-South or East-West direction. It is also used to find course and distance between two known positions.
The formula to calculate departure is as follows: Departure = d. long cos(middle latitude). Mean Latitude.
How do you convert latitude and longitude to distance?
For this divide the values of longitude and latitude of both the points by 180/pi. The value of pi is 22/7. The value of 180/pi is approximately 57.29577951. If we want to calculate the distance between two places in miles, use the value 3, 963, which is the radius of Earth.