EASA NAV(A)intermediate
A pilot plans to fly from Airport A to Airport B via two towns, using a chart, a plotter, and a navigation log to plan each leg. Which method is being prepared?
Answer
Dead reckoning
Explanation
### Why this is right
Planning the headings, distances, and times for legs between checkpoints is dead-reckoning preparation. A chart and plotter support the route measurements, while the navigation log records the resulting plan.
### The concept
Dead reckoning is based on estimating movement from a known position using direction, distance, speed, and time. It can be paired with pilotage: the towns provide visual checkpoints that the pilot can identify during flight. Pilotage alone would use the landmarks without relying on the full calculated leg plan. Satellite trilateration and inertial navigation determine position using different technical systems.
### The other options
- **B. Pilotage alone**: this uses visible landmarks but does not describe calculating headings, distances, and times for each leg.
- **C. Satellite trilateration**: this determines position from measured distances to satellites, rather than chart-planned leg calculations.
- **D. Inertial navigation**: this estimates movement from onboard motion sensors, not from a manually prepared visual-route log.
### Terms
- **Dead reckoning**: position estimation from planned direction, distance, speed, and elapsed time.
- **Pilotage**: navigation by identifying visual ground features.
- **Trilateration**: determining position from distances to known points.
- **Inertial navigation**: navigation that estimates movement from onboard motion and rotation measurements.
### Remember
A charted leg plan of headings, distances, and times is dead reckoning.
Related Questions
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