Reading Latitude And Longitude On A Sectional Chart
Sectional charts are used by pilots to navigate through the airspace. These maps provide detailed information about the terrain, airways, airports, and other important features. One of the critical pieces of information provided on a sectional chart is the latitude and longitude of any given point. In this article, we will discuss how to read latitude and longitude on a sectional chart.
Understanding Latitude And Longitude
Latitude and longitude are the coordinates that are used to specify a location on the Earth's surface. Latitude is the angular distance measured in degrees north or south of the equator, which is the imaginary line that circles the Earth at 0 degrees latitude. Longitude is the angular distance measured in degrees east or west of the Prime Meridian, which is the imaginary line that runs through Greenwich, England.
Locating Latitude And Longitude On A Sectional Chart
Sectional charts are divided into small squares called "chart sections." Each chart section is identified by a unique combination of letters and numbers. The latitude and longitude of any point on the chart can be found by locating the chart section that contains that point.
To locate a point on the chart, first, find the chart section that contains the point. Next, look for the intersection of the vertical and horizontal lines that run through the point. The latitude and longitude of the point are given in degrees, minutes, and seconds, and are labeled on the chart.
Converting Degrees, Minutes, And Seconds To Decimal Degrees
Decimal degrees are a more convenient way to express latitude and longitude coordinates, especially when using them in GPS devices or online maps. To convert degrees, minutes, and seconds to decimal degrees, use the following formulas:
Decimal Degrees = Degrees + (Minutes/60) + (Seconds/3600)
For example, if the latitude of a point is given as 42 degrees, 30 minutes, and 15 seconds, the decimal degrees would be:
42 + (30/60) + (15/3600) = 42.5042
Conclusion
Reading latitude and longitude on a sectional chart is essential for pilots to navigate through the airspace safely. By understanding how to locate and read these coordinates, pilots can accurately determine their position and plan their flight path. Remember to convert degrees, minutes, and seconds to decimal degrees for easier use in GPS devices or online maps.