12. NAVIGATION TOOLS
12-7
12.5 Predictor
The predictor is a tool for estimating your ship's future positions and behavior. The on-
screen predictor graphic consists of three pieces of your ship, drawn in true scale to
successive future positions. The position of the third symbol will be your approximate
position at the end of the time interval selected. The predictor is calculated using cur-
rent speed and rate of turn. Docking speed components (transversal bow speed,
transversal stern speed, transversal center speed and rate of turn) are assumed to be
stable during the prediction period. The predictor can be used in every steering-state,
including manual steering.
To activate and set the Predictor, show the [Predictor] page. Turn the display on or off
with [Display]. Set the time (30, 60, 90, 120, 150, 180 seconds), with [Time].
The Predictor is updated every three seconds internally and the status of the predictor
is shown with [Status] as shown in the table below.
Note: The ship speed must be 0.5 kn or higher. The predictor may not be displayed
or may not work properly if the speed is lower.
Indication Meaning
OK Speed is suitable, in accordance with estimation of ship’s
dynamics.
Not Enough Speed Speed is too low, in accordance with estimation of ship’s
dynamics.
Not Available. Reset Filter
May Restore.
Calculation not possible, in accordance with estimation of
ship’s dynamics.
Movement of
predictor
(three pieces)
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