Where can you find useful information to help you read a map?

The marginal data on a map provides essential information that helps in reading and interpreting the map effectively. This data typically includes details such as the map's scale, the types of symbols used, and other pertinent information that is crucial for understanding the geographical features and references depicted on the map. By consulting the marginal data, readers can gain insights into the orientation, distance, and various elements that may not be immediately clear from the map itself.

While legends, indices, and grid squares do serve their purposes, they don't provide the comprehensive support that marginal data offers for map reading. Legends primarily explain the symbols used on the map, indices help in locating places or features quickly, and grid squares are used for navigation but do not contribute to the overall comprehension of the map's details.