Final answer:
The base of a Low Frequency (LF) airway is typically 1,200 feet AGL for navigational safety. However, based on the options provided, the closest correct answer is 2,200 feet Above Sea Level (ASL), which is a standardized form of measurement for aviation altitudes.
Step-by-step explanation:
The question relates to the base of a Low Frequency (LF) airway. LF airways are corridors of airspace extending upwards from a specified altitude above the ground. They are a part of the navigational structure for aircraft, enabling them to follow defined routes from one place to another with the help of ground-based navigational aids. According to regulations, the base of LF airways is 1,200 feet Above Ground Level (AGL) in many countries, which accounts for safety and obstacle clearance. For standardized comparison, however, altitudes are often provided in terms of Above Sea Level (ASL). This ensures consistency no matter the actual ground level. It's essential to note that different countries may have variations in these base levels due to their specific airspace regulations. However, the options provided in the question don't include 1,200 feet AGL, but the closest value in ASL of the options given is 2,200 feet ASL, assuming this pertains to a standard altitude for the base of LF airways relevant to the question.