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1. OPERATIONAL OVERVIEW
1-18
1.9 Sensor Information, Datum Box
Color of nav data indications and sensor name
The color of the nav data indications and sensor names changes according to the
state of the sensor data. The table shown below provides basic indication and color
meanings. For detailed information, see Appendix 3. When no sensor data is received,
the sensor source indication is blank and the related indication shows asterisks.
Sensor information, datum box displays the
sensor data and the name of the datum in
use. The sensor indications and names are
colored according to sensor state. See the ta-
ble below.
• HDG: Heading and its source.
• SPD: Longitudinal speed and its source.
The direction of transverse speed is indi-
cated with arrows, , Starboard, , Port.
• COG: Course over ground and its source.
• SOG: Speed over ground and its source.
• POSN: Latitude and longitude position of
own ship and its source.
• Datum: Chart datum (WGS84, WGS72,
etc.) in use. No datum appears when there
is no datum sentence.
Note: The position source shall meet
the requirements of IMO MSC.112(73).
Nav data indication
Color of nav
data indication
Color of
sensor name
State
Green White Sensor is normal.
Yellow White Validity of data is low or
offset is applied.
Yellow-orange Yellow-orange Data is invalid.
Green, data
shown with as-
terisks (***.*)
No display Data is not being re-
ceived.
Yellow Yellow Data is input manually
(manual heading, gyro
correction, manual
speed, dead reckoning).
12.5
kn
0.3kn
GPS1
GPS1
286.0°T
13.1
kn
GPS1
30°00.0000'N
020°00.0000'E