Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Radar/Chart Radar User Guide Routes
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Turn
The Turn area enables you to edit the following turn attributes:

Turn Rate - the maximum turn rate is 1200°/minute.

Turn Radius - the maximum turn radius is 10 NM.

Speed - speed of turn, the maximum speed is 99 Kn

XTD Alarm - the cross track distance in metres that the ship can
stray from the route turn track line before an off track error alarm
occurs. Different values may be entered for the left and right side of
the route turn track line.
To change the turn rate, turn radius, speed of turn or XTD Alarm, click in
the relevant field, the text changes to green (editable). Move the trackball
left or right to change the values.
The turn rates for each turn must be less than or equal to the Own Ship’s
configured maximum turn rate.
The speed of turn is used to calculate the turn rate based on the displayed
turn radius data. However if the turn rate data is modified the turn speed is
used to calculate new turn radius data. Often the turn speed will be the
same as the approaching and/or departing leg. However, the system
provides the flexibility to enter different values. This is useful when it is
important to strictly adhere to a specific turn rate due to vessel type or
conditions.
The turn speed must be less than or equal to the Own Ship’s configured
maximum speed. If the turn speed is adjusted the read only value to the
right of the speed automatically adjusts (minus if the speed is less than the
leg speed, plus if the speed is more). If the turn of speed entered is greater
than own ship's speed a validation error is generated.