🔍 Key Concepts

• Maritime DGPS (Differential GPS) is a navigation aid used to improve GPS accuracy for ships • Think about which U.S. organization is primarily responsible for aids to navigation and marine safety broadcasts • Consider which agency commonly maintains coastal navigation infrastructure like buoys, lighthouses, and radio beacons

💭 Think About

• Which of these choices is directly involved with maritime navigation safety rather than general communications, air operations, or international regulation? • Who would logically install, maintain, and operate shore-based radio systems that send correction signals to ships? • Among the options, which organization regularly issues Notices to Mariners and manages many physical aids to navigation along U.S. coasts?

✅ Before You Answer

• Eliminate any agency whose main mission is not focused on maritime safety and navigation • Distinguish between an international rule‑making body and a U.S. operational agency • Ask: which agency would most likely own and maintain DGPS transmitter sites along the U.S. coastline?