GNAV 6

Which statement is correct about the scale of a Lambert projection?

• The scale reaches its minimum value at the standard parallels.

• The scale reaches its maximum value at the parallel of origin.

• The scale reaches its maximum value at the standard parallels.

• The scale reaches its minimum value at the parallel of origin.

The parallels on a Lambert conformal conic chart are represented by:

• straight lines.

• parabolic lines.

• arcs of concentric circles.

• hyperbolic lines.

How does the chart convergence change with latitude in a Lambert conformal projection?

• It changes with sine of latitude.

• It changes with cosine of latitude.

• It increases with increase of latitude.

• It is constant and does not change with latitude.

On a Mercator chart, at latitude 60° N, the distance measured between 002° W and 008° E is 20 cm. The scale of this chart at latitude 60° N is approximately:

• 1 : 278 000

• 1 : 5 560 000

• 1 : 2 780 000

• 1 : 556 000

On a direct Mercator chart, meridians are:

• parallel, equally spaced, vertical straight lines.

• inclined, equally spaced, straight lines that meet at the nearer pole.

• parallel, unequally spaced, vertical straight lines.

• inclined, unequally spaced, curved lines that meet at the nearer pole.

The chart that is generally used for navigation in polar areas is based on a:

• stereographical projection.

• direct Mercator projection.

• gnomonic projection.

• Lambert conformal projection.

On a direct Mercator chart, a Rhumb Line appears as a:

• small circle concave to the nearer pole.

• straight line.

• complex / spiral curve.

• curve convex to the nearer pole.

On a Lambert conformal conic chart, with two standard parallels, the quoted scale is correct:

• along the two standard parallels.

• along the prime meridian.

• in the area between the standard parallels.

• along the parallel of origin.

At 47° North the chart distance between meridians 10° apart is 12.7 cm. The scale of the chart at 47° North approximates:

• 1 : 2 500 000

• 1 : 8 000 000

• 1 : 3 000 000

• 1 : 6 000 000

On a Direct Mercator chart at latitude 45°N, a certain chart length along 45°N represents a distance of 90 NM on the surface of the earth. The same length on a chart along latitude 30°N will represent a distance on the earth of:

• 73.5 NM

• 45 NM

• 78 NM

• 110 NM