Furuno FCR-2107 Operator's Manual page 162

6. ECDIS Overview
How to verify speed settings (SPD/CRS page)
Select both Log and Dual log, if they are available, or select one of them, on the SPD/CRS page.
Note that manual speed should only be used in an emergency, when no other speed reference is available.
Remember that position sensors are also available as speed sources. If neither Log nor Dual log is available, you can
use a Ref tgt as the source for speed and course.
How to verify 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) that 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 that is considered to be most accurate and reliable. Set all other
navigation sensors as "Secondary".
V How to verify 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.
How to verify 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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