A flag with an "R" in it is what?

A flag with an "R" in it is what?

• A. Minimum Reception Altitude (MRA)
• B. Recommended Altitude
• C. Radar altitude interval
• D. Minimum Descent Altitude

Answer: (A)

In navigation charts, a flag containing the letter R marks the minimum reception altitude. This altitude is the lowest you can be and still reliably receive the navigation signal from the navaid for that segment. The reason this matters is that VOR, VHF nav signals are line-of-sight and can be blocked or degraded by terrain or distance. The minimum reception altitude ensures you stay high enough to maintain usable signal guidance along the route. So, the symbol with R specifically points to the Minimum Reception Altitude. It’s about keeping enough altitude to receive the navaid, not about a recommended cruising height, radar usage, or descent minima.

In navigation charts, a flag containing the letter R marks the minimum reception altitude. This altitude is the lowest you can be and still reliably receive the navigation signal from the navaid for that segment. The reason this matters is that VOR, VHF nav signals are line-of-sight and can be blocked or degraded by terrain or distance. The minimum reception altitude ensures you stay high enough to maintain usable signal guidance along the route.

So, the symbol with R specifically points to the Minimum Reception Altitude. It’s about keeping enough altitude to receive the navaid, not about a recommended cruising height, radar usage, or descent minima.