Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Basic Operation of Radar Radar/Chart Radar User Guide
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When in ground stabilised mode, the vector line is drawn to reflect the COG
shown on the sensor data display. When in water stabilised mode, the
vector line is drawn to reflect the course through the water based on the
current heading shown on the sensor data display.
Own ship vector is not drawn if Predicted Vector is enabled (see Display
Settings, Ownship) and the stabilisation mode is ground based
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.
In water stabilised mode own ship vector is drawn in addition to the
predicted vector.
If own ship vector's end point is not on the available area of the video circle,
a semicircle is drawn, centred at the point that the vector intersects the
edge of the available area.
Own ship vector is shown in red when the data received from the sensors
used to draw the vector (water or ground stabilised) is invalid or degraded.
If enabled, tick marks will be displayed along the vector length at one
minute intervals, with every sixth tick mark shown with double thickness.
The tick marks can be switched on or off, and the tick mark interval time
adjusted from the Display Settings sub-menu in the Nav Tools menu.
Predicted Vector
Predicted vector is a tool to indicate where the ship will go based on current
speed, course, and rate of turn. Predicted Vector is turned on and off from
Ownship tab in Display Settings, Nav Tools menu.
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This is the default presentation, set at commissioning. Ownship vector and predicted vector
may be selected for simultaneous display, but this is NOT the recommended setting.