Which of the following is NOT a critical piece of information to include on a route card?

A route card is a key tool used for land navigation, which outlines critical information for efficiently and safely navigating a route during military operations. It serves as a detailed guide that provides personnel with essential data to ensure they stay on track.

Map notations, while useful for understanding the terrain and topography, are typically not included on a route card itself. Instead, a route card focuses on more actionable and immediate information such as specific checkpoints, distances to those checkpoints, and significant landmarks that can aid in navigation.

Including weather conditions is vital because weather can greatly affect visibility and mobility. Similarly, landmarks are important for orientation and as reference points during navigation. Distances between checkpoints are crucial for estimating travel time and maintaining situational awareness.

Thus, the absence of map notations on a route card does not hinder immediate navigation, making it the correct answer to the question regarding what is NOT essential on a route card.