NAVIGATION; Chart Projections

The type of chart on which meridians of longitude and parallels of latitude are at 90° to each other is called:

Orthomorphic

An aeronautical chart which portrays the earth’s feature with a little distortion, is known as:

Orthomorphic

When applied to an aeronautical chart, the term topographical chart means:

That the earth’s features are represented with a minimum distortion

When the term Orthomorphic is applied to an aeronautical chart, it means that:

Meridians of longitude and parallels of latitude cut each other at 90°

Convergency is defined as being:

The angle between two adjacent meridians

Convergency:

Varies with latitude

  Convergency:

Is greater at high latitudes than it is at lower latitudes

  Convergency on the earth is:

Maximum at the poles and zero at the equator

  The type of chart projection which is constructed by placing a cone around an imaginary earth, so that it cuts the earth at two different parallels of latitude is called a:

Lambert conformal conic projection

On a chart constructed using the Lambert’s Conformal Conic projection:

Convergency is constant throughout the chart but correct only at the parallel of origin

On a Lambert’s Conformal Conic chart convergency is:

Zero at the equator

A practical method used to reduce the effects of convergency when measuring bearings on a Lambert’s Conformal Conic Chart is to:

Measure the bearing at the mid meridian

On Lambert’s Conformal Conic Projection:

The scale is only correct at the standard parallels

The scale on a Lambert’s Conformal Conic Projection is correct:

Only at the standard parallels

  On a chart constructed using Lambert’s Conformal conic projection:

Meridian lines are straight lines that converge towards the nearer pole

The meridians shown on a Lambert’s conformal conic projection will appear as:

Straight lines which converge towards the nearer pole

The Lambert’s conformal conic projection is created by:

Using a paper cone which cuts the imaginary earth at two different parallels of latitude

With reference to the Lambert’s Conformal Conic chart:

a. The shorter arc of a great circle track will be the shortest distance between two points

On a chart constructed using Lambert’s Conformal Conic projection, a rhumb line track:

a. Will always cut every meridian at the same angle

The significance of the two standard parallels on a Lambert’s Conformal Conic Projection is that:

a. They are the points where the cone of the projection cuts through the imaginary earth’s surface and therefore the scale of the chart is correct only at these points.