MOCA's extra function?

MOCA's extra function?

• A. Provides obstacle clearance only
• B. Guarantees 100% signal strength
• C. Enables satellite navigation
• D. Provides reception within 22 nautical miles of the station

Answer: (D)

The main idea behind MOCA is to ensure obstacle clearance along an IFR enroute segment. But there’s a useful extra function baked in: MOCA signals allow reception of the VOR/DME signals within about 22 nautical miles of the station. This can aid navigation and fix accuracy in areas where other navigation signals might be weak, even though the primary purpose is to guarantee obstacle clearance along the route. It’s not about guaranteeing 100% signal strength, it’s not about satellite navigation, and the obstacle clearance is the primary purpose—the extra, practical benefit you’ll use in close-in reception is the ability to receive the VOR/DME signal within that 22 NM radius.

The main idea behind MOCA is to ensure obstacle clearance along an IFR enroute segment. But there’s a useful extra function baked in: MOCA signals allow reception of the VOR/DME signals within about 22 nautical miles of the station. This can aid navigation and fix accuracy in areas where other navigation signals might be weak, even though the primary purpose is to guarantee obstacle clearance along the route. It’s not about guaranteeing 100% signal strength, it’s not about satellite navigation, and the obstacle clearance is the primary purpose—the extra, practical benefit you’ll use in close-in reception is the ability to receive the VOR/DME signal within that 22 NM radius.