18. NAVIGATION SENSORS
18-12
18.8.2 How to cancel position alignment
Click the [Offset] button to cancel the position offset.
18.9 Wind Sensor
ECDIS can display and output wind data in the following three formats:
Apparent: Windmeter-measured wind speed and direction.
Wind angle reference: Heading
North: True wind angle, true wind speed, referenced to North
Wind angle reference: True North
Theoretical: True wind angle, true wind speed, referenced to heading
Wind angle reference: Heading
The illustration below shows wind speed and direction with given ship data.
The wind values are as shown below.
Ship information:
COG: 60°
SOG: 8.7 kn
Heading: 45°
Wind angle Wind speed
Apparent 345° 10 kn
North (true wind, referenced to North) 330° 5 kn
Theoretical (true wind, referenced to heading) 285° 5 kn
Wind speed
(Apparent: 10 kn)
Apparent Wind
Heading
Angle (reference North)
Wind Angle
(North: 330°)
Wind Speed
(North/Theoretical: 5.0 kn)
Ship's Speed
(SOG: 8.7 kn)
True Wind
North
Wind from NNW (330°)
Wind Angle
(Apparent: 345°)
Wind Angle
(Theoretical: 285°)
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