36 
Effect 
For example 
Input information 
Output information 
Pseudo transit time 
measurement 
GPS 
Transit time 
Reference system 
LATxy 
LONxy 
UTC 
Pseudo transit time 
measurement with refer 
ence station 
DGPS 
Transit time 
Reference signal 
Reference system 
LATxy 
LONxy 
UTC 
Phase difference of ultra- 
long waves 
LORANC 
Signals of transmitting sta 
tions 
LATxy 
LONxy 
Radar 
RADAR 
Radar echoes 
Position and distance 
from foreign ships and 
surrounding objects in 
relation to the ship 
Dynamic pressure 
Dynamic pressure 
log 
Water pressure difference 
SOGX 
Electromagnetic induction 
EM-Log 
Induced electrical field 
SOGX 
Doppler’s effect 
DOLOG (xs-axis) 
Reflected signals 
SOGX 
STWX 
Doppler’s effect 
DOLOG (ys-axis) 
Reflected signals 
SOGYx 
STWYx 
Hydro-acoustic transit time 
measurement 
Depth sounder 
Signal transit time 
DEPTHx 
Earth’s magnetic field 
Magnetic compass 
Earth's magnetic field 
Inclination 
Deviation 
Position 
HDG 
Gyro effect 
GYRO 
Ship's rotation 
Reference angle 
HDG 
Air pressure difference 
Wind sensor 
Wind speed and direction 
RWS 
RWD 
Air temperature meas 
urement 
Thermometer 
Air temperature 
ATEMP 
Water temperature meas 
urement 
Thermometer 
Water temperature 
WTEMP 
Air pressure 
Barometer 
Air pressure 
BAR 
Air humidity 
Hygrometer 
Air humidity 
RHUM 
Table 4: Characteristic sensors 
Annex 7.4.1 contains the functionalities identified for this task as well as the elementary individual func 
tions with their input and output data, in overview form. 
42 Observing the environment 
The term “environment” comprises the following areas: 
• Hydrographic situation: currents, tides, swell 
• Meteorological situation: e.g. wind, air temperature and pressure, visibility conditions.