Sperry Marine Visionmaster FT ECDIS, User Manual

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Navigation Tools ECDIS User Guide
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Predicted Vector
The Predicted vector tool is used to indicate where
own ship will go based on current speed, course,
and rate of turn. Predicted vector is NOT intended
to access risk of collision.
Predicted vector is drawn either as a straight line or
an arc from own ship's CCRP. If own ship is
currently turning, a radius based on the selected
Rate of Turn sensor and the current ground
stabilised course and speed is drawn. If ownship is
not turning, a straight line is drawn.
The length of the predicted vector is based on the True Vector time setting
(up to 60 minutes) see Vector Modes. Dots are drawn on the predicted
vector line, the length between each dot is based on the Vector Tick Mark
interval time.
Target vectors and own ship vectors can be water stabilised or ground
stabilised, but the predicted vector is always ground stabilised. If the
system is in water stabilised mode ship's vector is drawn along the heading
line, in addition to the predicted vector.
A warning ` Predicted Vector Mismatch ' is raised if the current speed is
water stabilised when the predicted vector is displayed.
To turn off predicted vector and return to ownship vector untick the
Predicted Vector check box.
Predicted Outlines
Predicted Ship
The predicted ship indicates a series of predicted
position and heading samples of own ship based
on current speed, course, and rate of turn.
Predicted ship is drawn as a series of true scale
own ship symbols, shown as thin orange outlines
displayed along the length of the ship vector. The
true scale outlines are drawn regardless of range
scale.
The spacing between each symbol is equal to the Vector Tick Marks
Interval setting. The number of ship symbols drawn is equal to the vector
time (see Vector Modes) divided by the tick mark interval setting, rounded
down to the nearest whole number.