The INS is described as what type of navigation system?

• A. Dead reckoning navigation system.
• B. Inertial stabilization system.
• C. Satellite-based augmentation system.
• D. Radio navigation system.

Answer: (A)

The key idea is that an Inertial Navigation System uses dead reckoning to determine position. It measures motion with accelerometers and, in many designs, angular rates with gyroscopes. Starting from a known position and velocity, it integrates these measurements over time to estimate current velocity and position. Because there’s no need for external signals, the system remains self-contained and can provide continuous navigation data even when external navigation signals are unavailable.

That’s why this description fits best: it estimates location by applying the movement from a known starting point, rather than relying on external references. Inertial stabilization, satellite-based augmentation, and radio navigation describe different concepts—stabilization of a platform, GPS/GNSS-enhanced positioning, and position determination using radio beacons, respectively—so they don’t capture the primary function of an INS. Keep in mind that inertial sensors drift over time due to biases and noise, so INS data often requires periodic updates from external systems to correct accumulated error.