What does the acronym "RADAR" stand for?

The acronym "RADAR" stands for "Radio Detection and Ranging." This term is widely used in various fields, including marine navigation and aviation, to describe a technology that uses radio waves to determine the distance, angle, or velocity of objects. In the context of navigation, RADAR systems are critical for identifying other vessels, land formations, and obstacles, helping to prevent collisions and enhance situational awareness.

The other options present variations that do not reflect the standard definition of RADAR. "Remote Area Detection and Response" and "Radio Analysis and Distance Assessment" suggest functions that are not specific to how RADAR operates in terms of utilizing radio waves for detection and distance measurement. "Range and Distance Accurate Reporting" also fails to encapsulate the primary mechanics and purpose of RADAR technology; it focuses more on the reporting aspect rather than the detection and ranging which is central to the system's function. Thus, "Radio Detection and Ranging" is the accurate and accepted definition for RADAR.