Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Radar/Chart Radar User Guide Basic Operation of Radar
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The display of True or Relative vectors for trial
manoeuvre is determined by the Vector mode
selection button.
Enter the proposed vector time by left clicking in the value field and moving
the joystick left or right to increase or decrease the vector time.
The trial manoeuvre vector lengths displayed are dictated by the
selected vector time. Entering a longer vector time will allow you to
see further into the trial manoeuvre. If the vector time is not long
enough to cover the entire manoeuvre then only a part of a trial
manoeuvre vector will be displayed.
Trial Manoeuvre Vector
Own ship’s trial manoeuvre vector consists of
the following three sections:
 The first section is a straight line
continuing on the own ship's current
course and speed. The vector length is
calculated using the own ship’s current
speed and the trial manoeuvre delay
time.
 The second section consists of a circular arc between the end of
the first section and start of the third section. The arc radius is
determined by the manoeuvre rate of turn and the manoeuvre
speed.
 The third section is a straight line showing the final course of the
own ship at the manoeuvre speed.
Trial CPA and TCPA
It is possible to display target trial CPA and TCPA values predicted using
the trial manoeuvre parameters.
Any trial CPA and TCPA data is labelled TRIAL CPA and TRIAL TCPA
respectively and does not obscure the actual target data.
Trial CPA and TCPA data is displayed for selected target in the Target
Data window, see Target Data in Chapter 10, Targets.