2018-05-28
Page 31 of 60
Installation DL2 Doppler Speed Log System
Button (default) options What it is used for
Draft (meters) feet fath-
oms
Used to make the depth value show from the surface and not from
the sensor.
Vessel Max Speed (knot) m/s mi/h Used to set the calibration parameters and to ensure data is rea-
sonable.
Vessel Length meters Used to calculate The Aft transversal speed
(ROT signal must be input for this)
Sensor distance
from Bow
meters Used to calculate The Aft transversal speed
(ROT signal must be input for this)
Tonnage tonnes Used to set correct averaging time. Larger vessels will have
slower speed changes and may use a higher averaging to calculate
the speed.
SOG Averaging
time
seconds Manuel set of averaging time for SOG at speeds over 6kn. This
setting will override settings from “Tonnage”
SOG low speed
averaging time
seconds Manuel set of averaging time for SOG at speeds under 6kn. This
setting will override settings from “Tonnage”
STW averaging
time
seconds Manuel set of averaging time for STW at speeds over 6kn. This
setting will override settings from “Tonnage”
STW low speed
averaging time
seconds Manuel set of averaging time for STW at speeds under 6kn. This
setting will override settings from “Tonnage”
Current
calculation
(AUTO)
Log-SOG,
GPS-SOG
AUTO
The “Water current” speed and direction are calculated from the
STW measurement and an SOG from the log and/or a GPS input.
In deep water,(depths>150m) SOG is not available from the log.
AUTO will automatically change from log to GPS when log bot-
tom is lost.
Log-SOG will allways calculate “Water current” with SOG from
log.
GPS-SOG
GPS on lost bot-
tom
(ON)/OFF If the water is too deep, the system cannot measure SOG. This
option will switch the value to GPS (on screen) with a small sym-
bol to indicate where the data comes from.
The system will not send SOG data on its outputs in this case.
Vessel image 1-5 The image of a vessel can be changed to various vessel types.
SOG Shallow
ping length
1-(2)-4-8msec. Default 2msec.
May be set to 1msec for better shallow water
SOG Deep ping
length
1-2-4-(8)msec. Default 8ms for deeper bottom tracking
SOG Shallow
power
Low-Medium-
(High)
Default High. Power level of SOG signal in shallow water
DL1/DL2 synch OFF / (ON) In DL2 the systems can be made to ping simulataniously to pre-
vent acoustic cross over
Sampling Dis-
tance
(0.5)-16m The STW water sample can be moved further from the vessel to
reduce effects of drag.
Low speed correc-
tion
(ON) off activation of a lter to improve alongside data.
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