Which zone has a central meridian of 125°?

• A. Zone I
• B. Zone II
• C. Zone III
• D. Zone V

Answer: (D)

In this zone-based system, the central meridian is the longitude line that runs through the middle of a zone and serves as the reference for the projection within that zone. Distortion is minimized near this line and increases as you move away from it, so each zone has its own fixed central meridian.

If 125° is the central meridian assigned to the fifth zone, then that zone is Zone V. The other zones have different central meridians, so 125° doesn’t correspond to them.