MERCATOR

What are Meridional Parts used for?

• To calculate time differences

• To provide the relative distance from the equator to compensate the distortion

• To determine magnetic variation

• To find the deviation of the compass

How do Meridional Parts change as latitude increases?

• They remain constant

• They increase

• They decrease

• They fluctuate randomly

What is Meridional Parts?

• The length of a meridian on a Mercator chart between the equator and a given latitude

• The distance between two points along a parallel line

• The angular difference between two meridians

• The arc length along a rhumb line

What is the formula to calculate the Meridional Part of a certain latitude?

• log(sin(Latitude)+45)×7915.7+cos(Latitude)×23.2

• (Latitude ÷ 2) + 45 = Tan Log Ans × 7915.7 - Sin latitude × 23.2

• (Latitude×log(tan(45+Latitude/2))−23.2×cos(Latitude))

• tan(Latitude)×7915.7−log(cos(Latitude+45))

How are Meridional Parts obtained?

• Nautical manuals such as Jones' or Pike's tables

• Horizon tables

• Nautical references such as Davis' or Moore's tables

• Nautical tables such as Norie's or Bowditch's tables

What is Mercator Sailing?

• A method of navigation that uses spherical trigonometry to calculate great circle distances.

• A method of navigation that uses a flat Earth model and straight-line plotting for coastal voyages.

• A method of navigation that accounts for the Earth's curvature using Meridional Parts to plot a straight-line course on a Mercator chart.

• A method of navigation using the Gnomonic chart to find the shortest route between two points.

What is the effect of Mercator projection distortion at high latitudes?

• Distortion remains constant across the entire chart.

• Distortion decreases, making areas near the poles more accurate.

• • Distortion increases, causing areas near the poles to appear much larger than they actually are.

• Distortion is only present in the longitude lines, not latitude.

Since Mercator Sailing is used for long-distance voyages, over what distance can it be practiced?

• Less than 500 nautical miles

• 150 to 500 nautical miles

• 300 to 600 nautical miles

• More than 600 nautical miles

What type of projection does Mercator Sailing utilize?

• Mercato projection

• Conic projection

• Cylindrical projection

• Gnomonic projection

If the DLat is 686', DLo is 569', and the DMP is 839.4', what is the True Course?

• 33.13°T

• 34.13°T

• 33.14°T

• 34.12T