JRC JMA-5210-6 - Range and Bearing Measurement by Trackball

4.1 MEASUREMENT BY TRACKBALL
Procedures 1 Check the target echoes on the radar display.
2 Move the cursor mark to a target by the trackball.
The CURSOR on the radar display indicates the bearing and range of the target.
The range is a distance from own ship’s position.
CURSOR ( )
TRUE 45.0°: True bearing of the cursor relative to own ship
5.0nm: Range between the cursor and own ship
REL 45.0°: Relative bearing of the cursor relative to own ship
Own ship
Curso
r
Target
Figure 4.1
4─1