Chapter 4 Setup after installation MDC-7000/7900 Series
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4.2.4 Setting of STW to be used for SEA STAB
Select an input device for STW to be used for TT (ARPA), AIS, TM, True Trail and PST POSN at
stabilized speed against water.
In case of speed meter against water with pulse output such as LOG, the output shall be put in SDME
of this unit after conversion of the signal into that of IEC 61162-1 through LOG converter unit (optional
item: L12) inserted between them. Speed signal from GPS compass or GPS can be also input. For
setting of this, use of [AUTO] is recommended as shown below.
(1) [MAINTENANCE] => [I/O] => [STW] => [STW] => [AUTO], and press ENT key.
Set values: AUTO, VHW, VBW, VTG, RMC, RMB, RMA, MAN, CURRENT
MAN: This function is intended to input speed values manually. [MAN] is provided as an emergency
measure, because many functions of radar become unavailable when the speed meter is faulty.
However, when [MAN] is selected, AIS is not available.
CURRENT: This means that STW is calculated from ground speed data and SET/DRIFT data inputted
from VDR sentence or by manual.
4.2.4.1 How to input the STW value by manual
(1) [MAINTENANCE] => [I/O] => [STW] => [MAN] => [VALUE] will show the current setting of the input
value by highlighting the last digit value by the trackball.
(2) Move the TRACKBALL up or down to set the value. Press ENT key to save the set result.
Setting value: 0.0 to 100.0 kn
Note: The manual input data is displayed with yellow color.
4.2.5 Setting of COG/SOG to be used for GROUND STAB
Select an input device of COG/SOG to be used for TT (ARPA), AIS, True Trail and PAST POSN at
stabilized speed against ground. It is necessary to connect to GPS, Navigation device (VTG, RMC and
RMA), 2-axis SDME (VBW) or current meter (CURRENT).
(1) [MAINTENANCE] => [I/O] => [COG/SOG] => [COG/SOG] => [AUTO], and press ENT key.
Set values: AUTO, VBW, VTG, RMC, RMA, MAN, CURRENT
CURRENT: COG/SOG is calculated from STW and SET/DRIFT data.
Caution: When a ship has been brought to or is sailing, VTG, RMC and RMA of GPS may wamble in
the course. Therefore, the speed vector of TT (ARPA) may also wamble. In this case, use it at
the stabilized speed against water.
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