Introduction to Charts

Question 1

Graticule

Answer 1

Lines of equal latitude and longitude

Question 2

Conical projections

Answer 2

Uses CONES with a SMALL CIRCLE as the Circle of Tangency. For example, a parallel of latitude

• Lamberts Projection

Question 3

Planar / Azimuthal Projections

Answer 3

Flat plane that the Earth is projected onto from opposite end of the Earth, only one point of contact.

Used for polar stereographic charts

Question 4

Cylindrical projections

Answer 4

Piece of paper is wrapped around the earth with the earth projected onto it from the centre of the earth.

Direct Mercator

Question 5

Orthomorphic chart

Answer 5

• A conformal chart
• Graticule must cross at right angles
• Scale is the same or changes equally in all directions locally
• Scale is correct and all angles are correct
• Bearings are represented accurately

Question 6

Grid MORA

Answer 6

Min off route altitude.

If you fly at this alt you clear obstacles sufficiently

Question 7

Minimum mast height on a chart

Answer 7

300ft.

If below 300, no need to report to CAA.