What is the sector reference system?

• A. It is a system used for finding a specific area of a map, with four quadrants each containing four subquadrants.
• B. A color-coding scheme for map features.
• C. A projection that preserves area.
• D. A grid of latitude and longitude

Answer: (A)

A sector reference system is a simple two-level grid used to locate a map area. It starts by dividing the map into four equal parts (quadrants), and then each of those parts is further divided into four smaller parts (subquadrants). This creates a structured way to describe a specific area by noting which quadrant and which subquadrant it sits in, making communication and pinpointing locations quick and straightforward.

This matches the idea of finding a specific area on a map by a hierarchical grid. It’s not about color-coding map features, nor about projecting the earth in a way that preserves area, nor is it simply a grid of latitude and longitude for global coordinates.