Which statement about the INS is true?

• A. It radiates signals to communicate with satellites
• B. It is non-radiating and does not rely on ground-based or airborne support
• C. It requires continuous antenna alignment
• D. It depends on weather for accuracy

Answer: (B)

The main idea is that an INS is self-contained and non-radiating. It determines position, velocity, and attitude entirely from internal sensors—accelerometers and gyroscopes—that measure motion and rotate rates, then integrate those measurements over time. Because it doesn’t rely on external signals or transmit data to satellites or ground stations, it doesn’t radiate and doesn’t require ground-based or airborne support. This is why antenna alignment isn’t needed and weather isn’t the defining factor for its basic operation. Any drift in accuracy comes from sensor biases and bias instability, not weather conditions.