The INS aids the GPS receiver by being which of the following?

• A. Non-jammable.
• B. More accurate than GPS in all conditions.
• C. Provides altitude information.
• D. By itself replaces GPS during navigation.

Answer: (A)

An inertial navigation system contributes to GPS reliability by providing navigation data without relying on external signals. Because it uses onboard accelerometers and gyros, it isn’t susceptible to RF jamming or interference. That means the INS can keep producing position and velocity estimates even when GPS signals are denied or degraded, helping the GPS receiver maintain continuity and speed up reacquisition when signals return. It isn’t inherently more accurate than GPS in all conditions—the INS drifts over time without updates, so GPS corrections are still needed for long-term accuracy. It also doesn’t replace GPS by itself during navigation; the two systems work together, with the INS offering continuous data during outages and GPS providing precise updates to correct drift.