
BASIC RADAR PRINCIPLES 23
was north-up or course-up did not arise. It should be
noted that either orientation can be used with true
motion, irrespective of heading.
1.5.2.2
True-motion,
ground-stabilized presentation
To create ground stabilization of
a
true-motion presen-
tation, the origin of the picture is made to move across
the screen in a direction and at a rate which correspond
with the observing vessel's track over the ground. To
achieve this, the input data must have a component
(c) Radar display at 1030 hr
Figure 1.17 True-motion ground-stabilized presentation
which represents the observing vessel's course and speed
through the wate ...