Where do you find longitude?

• A. Vertical bars on sides
• B. Horizontal bar on top and bottom
• C. On the equator
• D. On the prime meridian

Answer: (B)

Longitude shows how far east or west you are from the prime meridian, and on nautical charts those longitude values are placed along the top and bottom margins. In other words, you read longitude from the horizontal bars at the top or bottom of the chart, while latitude values are read from the vertical sides. This arrangement helps you plot positions by combining the longitude from the top/bottom with the latitude from the sides. Remember, the equator is a specific latitude line, and the prime meridian is the zero-point for longitude, not a place where longitude numbers are read from.