What is a grid locator?

A grid locator is indeed a letter-number designator assigned to a geographic location, commonly used in amateur radio to provide a standardized way of identifying and sharing geographical positions. These locators are typically composed of a combination of letters and numbers, such as "FN31pr," which helps to define a specific area on the Earth’s surface.

Territorially, the globe is divided into grid squares that denote different geographical areas, aiding in the identification of stations and their locations, particularly for purposes like contesting and logging contacts in varying geographic locations.

This concise format not only simplifies communication among operators but also enhances the ability to track and log contact information accurately. Other options presented relate to different concepts; for example, titles referring to instruments or methods that don't pertain to the purpose of identifying geographic areas in amateur radio.