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Set up before departure · 59
Verify POSITION sensors
SENSORS push button
To select between
Speed/Course and Position
sheets to be opened either
press button
or go by cursor above
Speed/Course or Position text
and press SELECT
The data field of a position sensor contains a label (here GPS1, GPS2) which indicates the type of the sensor,
Primary-Secondary-OFF status that indicates, if the sensor is included or not, position in local datum, speed and
course. A DGPS position sensor has additional text Diff, if differential signal is in use.
Position sensors have priority, which is indicated using Primary and Secondary. Only one sensor can be primary
while the others can be secondary or off position. After OFF-state a position sensor is changed to secondary-state.
After secondary-state a position sensor is changed to primary-state and if there was already a position sensor with
primary-state it will be changed automatically to secondary-state.
SWITCH ”Primary” THAT SENSOR WHICH IS CONSIDERED TO BE MOST RELIABLE.
SWITCH “Secondary” OTHER SENSORS.
Verify KALMAN FILTER
The Kalman filter is an automatic process that will calculate the most probable position based on all position sensors.
The filter uses in its process all sensor that has not OFF as selection. For more information about Kalman Filter, see
Chapter "Filter operation".
Verify ALIGNMENT
The alignment is a correction given by the Chart Align function. It is used to move vessel "Correct" position if
position devices define "incorrect" position. Normally switch OFF in the start up procedure. For more information
about alignment, see Chapter "How to use position alignment".