EASA NAV(A)advanced
Explain why an aircraft may need to route through an intermediate navigation aid instead of flying directly between two aids.
Answer
Conventional radio navigation depends on receiving usable signals from the ground-based aids used along the route. If part of a direct route is outside the coverage of the relevant aids, the aircraft cannot rely on them for that segment. Routing through an intermediate aid can keep the flight within available coverage. The route and procedure should be checked on current charts.
Explanation
### Why this is right
The limiting factor is signal coverage. A direct line may include a segment where the aircraft cannot receive the needed aid, while a route through an intermediate aid may keep navigation tied to available coverage.
### The concept
Conventional radio navigation is based on ground-based transmitters and aircraft equipment that receives or uses their signals. Each planned route segment must be supported by the aids available for that segment. Remote or oceanic areas may have no ground-aid coverage, so this method may not be an option there. Charts also matter because routes, aids, and airport procedures can change; pilots need current information rather than relying on an outdated route depiction.
### What a good answer covers
- Radio navigation relies on ground-based aids and usable signal coverage.
- A coverage gap can make a direct segment unsuitable for this method.
- An intermediate aid can provide a route through available coverage.
- Current charts are needed because aids and procedures can change.
### Terms
- **Navigation aid (NAVAID)**: a system or facility that provides information for aircraft navigation.
- **Coverage**: the area where a navigation aid can be used.
- **Remote or oceanic area**: a region where ground-based navigation-aid coverage may be unavailable.
### Remember
Route through aids that can actually support each segment, and verify their status on current charts.
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