6.3.1 Radar images should be displayed by using
a basic colour that provides optimum contrast. Radar echoes should
be clearly visible when presented on top of a chart background. The
relative strength of echoes may be differentiated by tones of the
same basic colour. The basic colour may be different for operation
under different ambient light conditions.
6.3.2 Target trails should be distinguishable
from targets and clearly visible under all ambient light conditions.