Which of the following is a strength of the INS?

• A. It is subject to weather
• B. It can be jammed
• C. It is self-contained and cannot be jammed
• D. It requires external updates

Answer: (C)

Inertial navigation systems rely entirely on onboard sensors—accelerometers and gyroscopes—to track motion. Because everything is generated inside the unit, there’s no dependence on external signals like radio beacons or satellite feeds. That makes the INS immune to weather effects on external signals and resistant to RF jamming, since there’s nothing emitted by the system to be interfered with. So the strength is its self-contained nature and the fact that external signal interference can’t jam it. Of course, it’s not perfect—the measurements drift over time due to sensor biases, which is why an INS is often paired with external updates to reset that drift. But the fundamental advantage for robustness is its self-contained operation.