How do you use a protractor to determine a grid coordinate?

Using a protractor to determine a grid coordinate involves understanding how to interpret the grid on a map or chart accurately. The correct choice emphasizes the standard approach for locating coordinates on a grid system.

When you read it right and up, you are aligning your protractor with the vertical and horizontal lines that indicate the grid. This is essential because most grid systems, including military maps, are organized in such a way that the first coordinate typically represents the east-west direction (horizontal), and the second coordinate represents the north-south direction (vertical). By moving right, you identify the eastward position, and moving up allows you to pinpoint the northward position. This method ensures that you are accurately translating the grid reference into a precise location.

In contrast, other methods, such as reading left and down or measuring straight across, may not follow the systematic approach required in navigation and could lead to inaccuracies. Estimating from a known point can be useful but lacks the precision necessary for determining exact grid coordinates compared to using the established right and up method with a protractor.