Sperry Marine Visionmaster FT ECDIS, Руководство пользователя

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ECDIS User Guide Navigation Tools
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If true (T) vectors are selected, the trial vector shows own ship’s proposed
true course during the manoeuvre.
The Rate of Turn and the manoeuvre speed determine the radius of the
turn based on data entered. Effects due to tidal stream and leeway are not
taken into account.
If relative (R) vectors are selected, the trial vectors are applied to every
tracked target or activated AIS target, with own ship’s vector suppressed,
and show the course and speed of the targets relative to own ship.
Display of Vectors
Trial manoeuvre vectors are displayed when the following conditions are
satisfied:

The Manoeuvre On check box is ticked.

The heading is valid.

The scale ratio is valid for the display of target synthetics.
The display of True or Relative vectors for trial
manoeuvre is determined by the selection on
the upper toolbar.
Enter the proposed vector time by left clicking in the value field and moving
the trackball 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.