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15. Navigation Sensors
15-5
KALMAN filter
GPS in diff. mode
or SYLEDIS
selected as
PRIMARY
GPS in diff. mode
or SYLEDIS
selected as
SECONDARY
Any other than
GPS in diff. mode
or SYLEDIS
selected as
PRIMARY
Any other than
GPS in diff. mode
or SYLEDIS
selected as
SECONDARY
Position
used by
the system
Selected and position exist
Selected and position exist
Selected and position exist
Selected and position exist
Not
selected
Backup
Dead Reckoning
Selected and
position exist
Not selected
or no position
Not selected
or no position
Not selected
or no position
Not selected
or no position
Selected and
No position
(POSN)
(POSN)
(POSN)
HDG 071.0
°
SPD (WT) 15.6 kn
SB (POSN) 0.0 kn
COG (POSN) 071.0
°
SOG (POSN) 15.6 kn
59
°
31.206'N
024
°
36.731'E
WGS 84
DGPS
If the system changes the source of position because of lost sensor data or the differential mode is changed on a
DPGS device, the system immediately generates the alert "409 Position source change". If the Kalman filter is used,
the system generates the alert "410 Filter: Pos source change" after a time out period of 90 sec.
If a chosen DGPS sensor changes its operation mode and its status is primary or secondary, then the system
generates the alert "727 DGPS pos. source change" (727 for first sensor, 728 for second, etc.). These alerts are not
generated if the operator has chosen Pri no alert or Sec no alert.
If source of position includes a position sensor that is in datum mismatch condition, the latitude, longitude and
chosen datum are displayed in red.