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15. Navigation Sensors
15-9
The figure below shows the source of water speed is used for drift calculation.
Manual
SPEED
LOG
(Water track of
dual-axis doppler
log OR pilot log)
RADAR
(measures
water speed)
SOG, if available
from any of
selected position
receiver
Alarm 401
No Speed
Available
Speed
used by
the system
(water
speed)
Selected
Selected and value exists
Available
Selected and value exists
Not selected
Not selected
or no value
Not selected
or no value
Not available
HDG 071.0
°
SPD (WT) 1.8 kn
SB (POSN) 1.7 kn
COG (POSN) 045.1
°
SOG (POSN) 2.0 kn
59
°
31.206'N
024
°
36.731'E
WGS 84
DGPS
Drift used by the system is shown in the Other page of the Sensors dialog box. In the example below, set and drift
have been entered manually since the Manual box is checked. Other text that may appear to show source of set and
drift are
(LOG): Log or dual-axis log
(POSN) Position sensor
(FILTER): Kalman filter
(MAN): Manual entry..
Manual
DRIFT
Drift
used by
the system
Selected
SOG/COG used by the system
Heading used by the system
Speed (water speed) used by the system
Not selected
Calculator