Furuno FCR-2107 series, Operator'S Manual

Page: 370 / 556

15. Navigation Sensors
15-2
Ref tgt:
Speed according to reference target.
Gyro 1:
Heading source is a gyrocompass. "(mag)" means the source is magnetic heading. True heading source has no
indication. If the source of Gyro1 is a gyro with synchro or stepper interface, the indication "(require set)" appears
when you need to set a new initial value for the gyro.
Rate gyro:
Heading source is a Rate of Turn gyro. "(calc.)" means the rate of turn is calculated from gyro movement.
Setting initial value of Gyro 1:
Initial setting of gyro1 is not necessary if it outputs serial data. However, if it is of synchro or stepper type, you will
need to set initial gyro value. If gyro1 requires initial value, then the indication "(require set)" is displayed. Use the
scrollwheel to enter initial value. After you enter a value "require set" disappears.
Posn (Position) page
The field of a position sensor contains a label (here
FURUNO and MX 200) which indicates the name of
the sensor; a status (primary/secondary/off) which
indicates if the sensor is used or not; position at conning
position and local datum; speed and course which has
(mag) if the course is referenced to magnetic north. A
DGPS position sensor has additional text Diff, if
differential signal is in use. Latitude and longitude
values will appear in red and with additional text in the
following conditions:
•
Kalman filter has excluded the sensor from its
estimated position. Additional text is "Excluded".
•
Received position from position sensor is in
another datum as set to be received in the chart
radar. Additional text is "Datum".
•
If position sensors have position discrepancy
active. Additional text is "Discrepancy".
SPD/CRS POSN
DR
LORAN
Off
°
kn
kn
kn
kn
DGPS-1st
NM
Position sensors have priority, which is indicated as "primary" or "secondary". Only one sensor can be primary
while the others can be secondary or off. If a position sensor is changed from secondary to primary state and another
position sensor was chosen as primary, then that sensor previously selected to primary state is then automatically
selected to secondary state. When the position source is changed based on priorities and signal validity to another
position source, then you get the alert "409 Position source change". Note that alert 409 is active only when the
Kalman filter is off because the filter has its own process to calculate estimated position and in that process priority
given by primary and secondary is not used.
If a DGPS is chosen as primary or secondary, and its status changes from "no Diff" to "Diff" or from "Diff " to "no
Diff" the system generates the alert "727 DGPS pos. Source change" (alert numbers are from 727 to 732 depending
on position receiver).