Source Of Sog, Cog, Speed, Heading, Rot, Drift And Docking Speed Components - Furuno FEA-2107 Operator's Manual

19.5 Source of SOG, COG, Speed, Heading, ROT,
Drift and Docking Speed Components
The figure below shows how various sources of navigation data are chosen. "SOG, COG" is speed over ground and
course over ground, respectively. "Speed" is speed over water, "Drift" is the difference between speed over water
and speed over ground. Docking speed components are bow speed (transversal), stern speed (transversal) and center
speed (longitudinal).
Heading used by the system is shown at the upper right corner of the ECDIS display. In the example shown below,
heading is received from a gyrocompass and it is shown without additional text, meaning the value is referenced to
true North. Additional gyro-related text which may appear are "(mag)" if the value is referenced to magnetic North,
"(man)" if the value has been manually entered; or "(corr)", which is displayed in red, if the value includes gyro
correction.
Manual
COURSE
Not selected
Not selected
or no value
°
59 31.206'N
°
024 36.731'E
WGS 84
DGPS
HDG 070.0°
SPD 1.8
(CALC) Kt
SB 1.7
(POSN) Kt
COG 045.1°
(POSN)
SOG 2.0
(POSN)
Kt
ROT used by the system is shown in the Speed/Course page of the Sensors dialog box. The Rate Gyro field shows
the text "(calc.)" when the system calculates ROT from movement of heading. No text is shown when the value is
received from an ROT gyro.
Calculated ROT
Selected in Installation parameters
from movement
of Heading
Not selected in Installation parameters
ROT Gyro
No value
GYRO 1
GYRO 2
Not selected
or no value
Value exists
Alarm 4018
ROT gyro error
Selected
Selected and value exists
Selected and value exists
GYRO from
RADAR
Not available
ROT
used by
system
19. Navigation Sensors
Heading
used by
the system
Available
Alarm 2002
No Course
Available
Spd/Cse
Posn
19-9