Which of the following is the cardinal rule to read grid squares?

The cardinal rule to read grid squares is to read right, then up. This method is essential for accurately locating a position on a map. When you read right first, you determine the easting value of the grid square, which indicates how far east you are from the origin. After identifying the easting, you read up to find the northing value, which tells you how far north you are from the origin. This sequence ensures that you correctly interpret the coordinates, allowing for precise navigation and positioning on maps.

Using any other method might lead to inaccuracies in understanding grid coordinates. For instance, reading left or down first could result in misreading the numbers related to the grid square, thereby undermining the effectiveness of navigation efforts in the field. Therefore, adhering to the rule of reading right and then up is crucial for maintaining accuracy in map reading and orientation.