What type of instrument system primarily assists pilots during low visibility conditions?

The Instrument Flight Rules (IFR) system is designed specifically to assist pilots during low visibility conditions. In such scenarios, visual references outside the aircraft may be severely limited, making it imperative for pilots to rely on instruments to navigate and control the aircraft safely.

The IFR system utilizes a range of onboard instruments, including altimeters, attitude indicators, and navigation aids, which provide crucial flight information such as altitude, heading, and speed. It also incorporates procedures and regulations that govern how aircraft operate in controlled airspace and under Instrument Flight Rules, ensuring that pilots can maintain separation from each other and safely navigate their routes, even in adverse weather or low visibility situations.

In contrast, options like the fuel management system, which focuses on ensuring that fuel levels are adequate for flight, and the visual flight rules (VFR) system, which is primarily used when pilots can see the ground and navigate by visual reference, do not provide the necessary support for flying in low visibility. A standard navigation system may assist with routing but does not encompass the broader operational and procedural requirements defined under IFR in difficult conditions.