Ch 4

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Last updated 4:28 AM on 6/30/26
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7 Terms

1
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What is the difference between charts and maps?

Charts are based on lat/long.

2
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What are the types of projections?

Gnomonic projection, mercator projection, Conic projection, and secant conic projection.

3
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Describe gnomonic projection.

One point of accuracy. Limited in aviation. Further from the focal point = less accurate.

4
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Describe Mercator Projection.

Cylindrical chart projection, can represent lines of constant course (rhumb lines) are straight, distorted at poles.

5
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Describe Conic Projection.

Reference parallel.

6
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Describe Secant Conic Projection.

Often used for aeronautical charts. Two reference parallels. Straight line approximates great-circle route.

7
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What is CA and CF?

Convergence angle (the gap), convergence factor (1 for sphere, CF*long=change in TC)