(L) and (T) symbols on a high altitude enroute chart refer to a NAVAID having a ___________ on its usable range.

(L) and (T) symbols on a high altitude enroute chart refer to a NAVAID having a ___________ on its usable range.

• A. restriction
• B. coverage
• C. range
• D. reliability

Answer: (A)

The symbols indicate a limitation on how far you can reliably receive that NAVAID. When you see them, it means the usable range is restricted, so you can’t assume full performance across the entire nominal range. That’s why the answer is restriction—the chart is signaling a specific limitation on where the aid can be trusted, not a general claim about its typical distance, complete coverage, or overall reliability. In practice, plan for alternative navigation or cross-check with other aids if you’re near the edge of that restricted area.

The symbols indicate a limitation on how far you can reliably receive that NAVAID. When you see them, it means the usable range is restricted, so you can’t assume full performance across the entire nominal range. That’s why the answer is restriction—the chart is signaling a specific limitation on where the aid can be trusted, not a general claim about its typical distance, complete coverage, or overall reliability. In practice, plan for alternative navigation or cross-check with other aids if you’re near the edge of that restricted area.