Quantum sensors, inertial navigation, and GNSS: a reader's map

Positioning, navigation, and timing—PNT—can combine several sources of information. GNSS can provide external positioning and timing signals. Inertial systems estimate motion from onboard sensors. Maps, cameras, radio signals, and other aids may constrain an estimate when one source is weak. A quantum sensor is a measurement technology, not a complete navigation architecture. Its role depends on the measurand, interface, update rate, calibration, and the rest of the estimator. The word quantum does not tell a reader which of those pieces are present.

Build the system map

For a public story, list the inputs, the estimator or fusion method if disclosed, the output, and the reference system used in testing. Explain whether the work concerns timing, inertial measurement, gravity, magnetic measurement, or another signal.

Avoid replacement language

Describe a system as complementary, experimental, or intended for resilient navigation when that is what the evidence supports. Do not use GPS-free as a shortcut that hides other aids or external dependencies. The purpose is not to rank technologies. It is to make the architecture visible enough for readers to understand the demonstrated role.