Page 816 - PPL-engelsk 2025
P. 816
Navigation
Due to the curved shape of the earth, it is impossible to reproduce it completely
correctly. In order to make the map as true to life as possible, certain
modifications and mathematical calculations have been made when
constructing every map.
However, all maps must be conformal, i.e. true to angle and scale. This implies:
- all latitudes and longitudes intersect in straight lines
- all measured angles are reliable
- the scale must increase or decrease from meridians and parallels
The relationship between a certain distance on the map and the corresponding
the distance on the surface is called the scale or scale ratio of the map.
In a conformal map, the scale cannot be kept constant over the entire extent of
the map, and the given scale is therefore only correct for the specified point or
area.
9.4.1.2 Map – projection methods
There are different ways of projecting maps.
- Plane projection
- Conical projection (conical)
- Cylindrical projection
Which method is used depends on what the map is to be used for.
Our ICAO map is a conical projection.
9.4.1.3 Lambert's conformal conic projection
o
o
At our latitudes (20 – 70 ), a type of map called Lambert's conformal conic
projection is usually used - colloquially Lambert map.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 816
