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Navigation Sensors · 339
DUALLOG
(Bottom track of
dual axis doppler
log)
RADAR
(measures
SOG/COG
from target
= Autodrift)
Average of
SOG/COG from all
selected Decca,
Loran or
Ref.Target
KALMAN filter
calculation result
from the movement
of position
SOG/COG
used by
the system
Selected and value exist
SOG/COG from all
Average of
selected DGPS,
GPS or SYLEDIS
Selected and value exist
Selected and value exist
Selected and value exist
Not selected
or no value
Water speed
and
Gyro heading
Selected and
value exist
Not selected
or no value
Not selected
or no value
Not selected
or no value
Not selected
or no value
Not selected
or no value
If Track Control
in use and
Last plausible
speed
Selected and
value exist
SOG/COG used by the System is shown in right hand upper corner of ECDIS display. In this case COG and SOG
are from selected position sensors and it is shown as (pos). Following alternatives are available: (bot) if value is
based on bottom tracking dual axis log; (wat) if the value is based on water tracking log, (rtgt) if the value is based
on target tracking in the connected ARPA radar, (arpa) if the value is based on mixed sources of COG and SOG in
the connected ARPA radar, (pos) if value is based on average of selected position sensors; (filter) if value based on
Kalman Filter; (man) if value is based on manual entry, (LAST) if value is based on last plausible speed. Note that
(pos), (bot), (wat) and (man) could come from direct interfaces of the system or from the connected ARPA radar.
(LAST) is a special case which is used if all speed sources were lost in middle of track control mode. Track control
modes include Goto Wp, Goto Track and Program Track. If last plausible speed is used then the value of own ship
position, sog and cog are in red colour.
Bow and
stern speed
used by
the system
SOG/COG used by the system
Heading used by the system
Speed (water speed) used by the system
Calculator
ROT used by the system
Installation parameter offset values
The figure above show the source of docking speed components used for predictor.