Which tool is used to measure and draw lateral limits on a fire plan sketch?

The tool used to measure and draw lateral limits on a fire plan sketch is the protractor. A protractor is specifically designed for measuring angles, which is essential in creating accurate fire plans, particularly when determining the angles of firing and the spread of fire in relation to different terrains or obstacles.

In fire planning, establishing lateral limits involves understanding the orientation and angles related to the target area, which is where the protractor’s functionality comes into play. By using a protractor, planners can effectively visualize and represent these limits, ensuring that all involved in the operation have a clear understanding of the boundaries within which to work.

Other tools mentioned serve different purposes. A calibrated ruler is primarily for measuring linear distances but does not aid in creating angular relationships. A compass is used for navigation and determining cardinal directions, which may assist in orientation but is not specifically tailored for creating fire plan sketches. A fire control computer employs various inputs to calculate fire trajectories and other elements but does not directly aid in sketching angles or limits. Thus, the protractor is the appropriate choice for accurately establishing lateral limits in fire plan sketches.