6. ECDIS Overview
6-17
Verifying position sensors (POSN page)
On the POSN page of the SENSORS dialog box, the data field of a position sensor
contains a label(s) (in the figure at right it is FURUNO and MX200) which indicates
the type of the position sensor. Primary-Sec(ondary)-OFF indicates sensor status and
priority. Position in local datum, speed and course are also shown. A DGPS position
sensor also shows the text "Diff" if the differential signal is in use.
Position sensors have priority, which is indicated by Primary and Sec(ondary). Only
one sensor can be primary while the others can be secondary or off position. After a
sensor is turned off, its status is changed to Secondary state. When a position sensor
state is changed to primary and another sensor was primary, the sensor formerly
primary becomes secondary.
Select the "Primary" navigation sensor as the sensor which is considered to be most accurate and reliable. Set all
other navigation sensors as "Secondary".
Verifying Kalman filter (POSN page)
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 sensors that are not selected to OFF. For more information about the
Kalman Filter, see section 15.6 Kalman Filter.
Verifying alignment (POSN page)
The alignment is a correction given by the chart align function, and it is used to move the ship to the "correct"
position. Normally turn this feature off in the start-up procedure. For more information about position alignment, see
section 15.6.1 Position alignment.
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