Avielevate / DGCA CPL papers / Air Navigation / Projections
Projections — DGCA CPL Air Navigation
Chapter GN03 of the Air Navigation paper. 52 practice questions in the Avielevate bank, every one with its answer key, filterable into a timed set on this chapter alone.
What this chapter covers
The learning objectives we file Projections questions under, and how many sit behind each. These come straight out of the bank and are regenerated whenever it changes — they are what is there today, not a claim.
| Learning objective | In the bank |
|---|
| __GEN__ General | 52 questions |
Sample Projections questions, answered and explained
Real questions from this chapter, with the answer marked and the reasoning written out — the same explanations you get inside the app.
0211053 · Projections
On which projection are Jeppesen radio navigation (en-route) charts based?
- ALambert's conformal conic projection
- BMercator's projection
- CIMPP
Why that is the answer
A chart projection is a way of drawing the curved Earth on flat paper. For a **Lambert conformal conic** projection, imagine a cone placed over the globe so that it cuts the Earth along two lines of latitude (the **standard parallels**), then unrolled flat. Look at the diagram.
Jeppesen en-route radio navigation charts are drawn on this **Lambert conformal conic** projection, because it suits them very well:
- it is **conformal**: angles and shapes are correct over small areas, so bearings can be measured accurately;
- its scale is almost constant across the chart;
- a straight line drawn on it is very close to a great circle, which is the shortest route and also the path a radio signal follows.
That makes it ideal for plotting radio bearings and airways in mid-latitude regions.
0211090 · Projections
Maps show the details of the topography (terrain and ground features). Pilots can use this for:
- AContact navigation
- BInstrument flying
- CDead reckoning navigation
Why that is the answer
**Topography** means the visible features of the ground — hills, rivers, roads, railways, towns and coastlines.
When a pilot navigates by looking out of the window and matching these ground features with the map, it is called **contact navigation** (pilotage or map reading).
So the topographical detail on maps is used for contact navigation.
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Frequently asked
How many Projections questions are there for the DGCA CPL Air Navigation paper?
Avielevate's bank carries 52 published Projections questions for Air Navigation, mapped across 1 learning objective. Every one has its answer key, and explanations are being written across the whole bank.
How much of the Air Navigation paper is Projections?
The DGCA does not publish a per-chapter breakdown of its papers, so nobody can honestly tell you — and we will not guess. What we can tell you is what students who have just sat a paper reported meeting, which is measured rather than rumoured: that is the exam recall report inside the app.
What is the best way to revise Projections?
Sit a short timed set on this chapter alone, tag how sure you were of each answer, then drill the two that actually leak marks: the ones you got right while guessing, and the ones you got wrong while confident. Avielevate does that tagging for you and puts anything you got wrong back in front of you on a spaced schedule.
The rest of the Air Navigation paper
One account covers every chapter of every paper.
← All Air Navigation chapters · All six DGCA CPL papers