Simrad SD570, Руководство оператора

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Modes of operation
5
850--160138 / A
2.4 True motion
In true motion the picture is locked to a geographical position,
with true north up, as shown in figure 3.
Figure 3 - True motion
The ship symbol moves around on the screen according to the
course and speed readings. All echoes are always in correct
position relative to the ship, and their movements on the screen
will be a true representation of the movements of the targets
through the water.
When the ship symbol reaches the screen edge, it will
automatically be moved to the centre or to a position
determined by the DISPLAY CENTRE button. This position is
reset to the screen centre whenever the mode is changed.
When selecting TARGET TRACKING, the target will
automatically be moved to the screen centre. In this mode the
DISPLAY CENTRE button will bring the target back to the
centre in case it has moved. The target will also be moved to the
centre when changing range.