You can pinpoint any place on Earth using a single set of coordinates: latitude and longitude. These coordinates look like a string of numbers. Once you have those numbers, you’ll be able to plug them into a web map, GPS, or other mapping device and find what you’re looking for in an instant — no matter where on the planet it is.
Using latitude and longitude information makes it easy to find your ancestors’ homestead, your own house, the county courthouse in a distant city, or any other location of genealogical interest.
The coordinates are similar to the Xs and Ys you used to plot in algebra class. Imagine if the surface of the Earth could be stretched flat. Then suppose you place a grid on top of the flattened world. You could pinpoint any location by finding the spot where the horizontal and vertical grid lines intersect. The horizontal x-axis is the equator, while the vertical y-axis is the Prime Meridian, which runs through the Greenwich Observatory in England.