Using Test Targets As A Training Exercise - Sperry Marine Visionmaster FT ECDIS User Manual

Targets

Using Test Targets as a Training Exercise

The following training exercise using movable test targets may be
undertaken.
1. In order to make the CPA/TCPA calculations easier to visualize, it
is advisable to make own ship stationary. To do this, right click on
STW on the Sensor Data Display, and click Select STW Source
from the drop down list. In the STW window select MAN sensor
data source, fixed at 0.0.kn, and confirm selection.
2. Select Test Tracked Targets from the Targets menu and ensure
the Fixed Test Targets Display check box is unticked.
3. In Moveable Test Targets select Test Target 1and tick the Target
Active check box.
4. Adjust the speed and true course of Test Target 1 so that it is
heading in an approximate direction towards own ship.
5. Select the test target on the screen by clicking on the beginning of
its video trail. Click on the selected target again to display the
Target Data tab for the selected test target.
6. Note the target's range and other attributes. Apart from Range and
True Bearing all other target data will be displayed in amber. If the
TCPA shows as a negative value, go back to the Test Targets
window and re-adjust the target's true course accordingly.
7. As the test target moves closer to own ship and the TCPA moves
towards zero, note how the range comes to match the calculated
CPA.
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ECDIS User Guide
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