Final answer:
The size of a grid square on most large-scale maps depends on the specific map and purpose. In the United States, the Public Land Survey System uses a grid system with townships, sections, and smaller parcels.
Step-by-step explanation:
The size of a grid square on most large-scale maps can vary depending on the specific map and the purpose of the map. However, one common example is the system used in the United States, known as the Public Land Survey System. In this system, the basic unit of division is the township, which is a square parcel of land six miles wide. Townships are further divided into sections, which are one-square-mile parcels. These sections can then be divided into quarter sections and quarter-quarter sections, each covering a smaller area.