Navigation Aids (NAVAIDs) Flashcards
6 cards from real FAA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Navigation Aids (NAVAIDs) flashcards as text
On a sectional chart, the mileage shown between two waypoints along a Victor airway is measured in what units?
Answer: Nautical miles
Distances along airways and between waypoints on sectional charts are always expressed in nautical miles (nm).
What does 'MEA' printed alongside a Victor airway on a sectional chart stand for?
Answer: Minimum Enroute Altitude
MEA (Minimum Enroute Altitude) is the lowest published altitude along an airway segment that ensures obstacle clearance and adequate signal reception from NAVAIDs.
What is the purpose of the 'MOCA' value sometimes shown along Victor airways on sectional charts?
Answer: It is the Minimum Obstacle Clearance Altitude, guaranteeing terrain clearance but only NAVAID reception within 22 nm of a VOR
The MOCA (Minimum Obstruction Clearance Altitude) ensures obstacle clearance along the full route but only guarantees VOR signal reception within 22 nautical miles of the VOR.
On a sectional chart, an 'off-route obstruction clearance altitude' (OROCA) value in a grid box ensures what?
Answer: 1,000 feet above highest obstacle in non-mountainous areas; 2,000 feet in designated mountainous areas
The OROCA gives 1,000 feet obstacle clearance in non-mountainous areas and 2,000 feet in designated mountainous areas within each latitude/longitude grid square on sectional charts.
On a sectional chart, what does 'T' printed in the corner of a NAVAID data box signify?
Answer: Terminal VOR with limited service volume (25 nm, 12,000 feet)
A 'T' in the NAVAID box designates a Terminal VOR (TVOR) with a service volume limited to 25 nautical miles and 12,000 feet altitude, suitable only for terminal area navigation.
On a sectional chart, what does a change in the MEA value along a Victor airway at a fix indicate?
Answer: The minimum IFR altitude changes at that point due to terrain or NAVAID coverage differences
An MEA change at a fix on a Victor airway indicates a different minimum safe altitude applies on the next segment due to varying terrain, obstacles, or NAVAID reception requirements.