Which projection is commonly used by airline pilots due to its circle routes?

Which projection is commonly used by airline pilots due to its circle routes?

• A. Mercator Projection
• B. Polar Projection
• C. Robinson Projection
• D. Gnomonic Projection

Answer: (B)

When pilots plan a flight, the shortest path between two points on the globe is a great-circle route. A map projection that turns those great circles into straight lines makes it much easier to plot the exact route by drawing a single line on the map. That is the key advantage of the gnomonic projection: every great-circle route appears as a straight line, which is why it’s especially useful for airline navigation, at least in the planning stages. Gnomonic maps have distortions that get worse away from the center, so they don’t show the entire world cleanly and aren’t used as everyday world maps. Other projections have different strengths—Mercator preserves angles and is convenient for other kinds of navigation, but great-circle paths curve on it; the Robinson projection offers a visually balanced view but doesn’t map great circles to straight lines; a polar projection centers on a pole and is best for polar regions, not general route plotting. The essential idea is that the gnomonic projection uniquely simplifies shortest-path navigation by making great circles straight lines.

When pilots plan a flight, the shortest path between two points on the globe is a great-circle route. A map projection that turns those great circles into straight lines makes it much easier to plot the exact route by drawing a single line on the map. That is the key advantage of the gnomonic projection: every great-circle route appears as a straight line, which is why it’s especially useful for airline navigation, at least in the planning stages.

Gnomonic maps have distortions that get worse away from the center, so they don’t show the entire world cleanly and aren’t used as everyday world maps. Other projections have different strengths—Mercator preserves angles and is convenient for other kinds of navigation, but great-circle paths curve on it; the Robinson projection offers a visually balanced view but doesn’t map great circles to straight lines; a polar projection centers on a pole and is best for polar regions, not general route plotting. The essential idea is that the gnomonic projection uniquely simplifies shortest-path navigation by making great circles straight lines.