What do Enroute Low Altitude Charts (LO Charts) provide?

Enroute Low Altitude Charts (LO Charts) are specifically designed to provide navigational information for pilots operating under Instrument Flight Rules (IFR) at altitudes below 18,000 feet. These charts include vital information such as airways, navigational aids like VORs and NDBs, safe altitudes, and other routing details that are crucial for IFR navigation in lower airspace. They help pilots ensure safe flight paths while adhering to air traffic control regulations and utilizing the available navigational resources.

The other options do not accurately represent the primary function of LO Charts. The first option mentions VFR pilots at high altitudes, which is outside the intended use of LO Charts. The third option suggests regular flight planning for medium airspeeds, which doesn't focus on the specific altitudes and navigational needs of IFR operations. Lastly, the fourth option implies that LO Charts only contain airport-related information, which overlooks their comprehensive navigational content. Thus, the chosen answer correctly highlights their essential role in supporting IFR flights below 18,000 feet.