What is the position of the red mark on this chart?
A chart extract. The latitude scale up the left side is marked 45°10'N, 45°20'N and 45°30'N from bottom to top. The longitude scale along the bottom is marked 001°40'W, 001°20'W and 001°00'W from left to right. A red mark sits halfway between the 10 and 20 minute latitude lines, and halfway between the 30 and 20 minute longitude lines.
Show the answer
45°15'N 001°30'W. Read latitude off the scale at the side and longitude off the scale along the top or bottom. The mark is halfway between 45°10'N and 45°20'N. West longitude increases to the left, so it is 10 minutes west of the 001°20'W line.
