Chapter 6 MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Using The Menu
Operation Manual
6-16
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Table 6.1 Available NMEA sentences and talker devices
Sentence Talker
identifier On-screen display
Device name
VD
DO LOG/WT-Speed
Doppler LOG
VM LOG Speed
LOG,
magnetic
VHW
VW LOG Speed
LOG,
mechanical
VBW
VD
DO LOG/BT-Speed
Doppler LOG
6.4.1.4
GND STAB SPD (Ground Stabilized Speed)
This function is used to select the signal source of the ground speed and set/drift
inputs. The available selections include; MAN (Manual setting), PULSE (Pulse signal
supplied from a speed log) and the NMEA sentences.
Indication Meaning
Selection
GND STAB SPD
Speed stabilized over ground
See the following table.
SET / DRIFT
Set: The direction towards which
See the following table.
current flows.
Drift: The speed of a current
Table 6.2 Combinations of GND STAB SPD and SET/DRIFT
GND STAB SPD
SET/DRIFT
Notes
MAN MAN
PULSE MAN
VHW MAN
VHW VDR
VBW
Not need
Set/Drift data included in the sentence
only if VBW delivers GND based data
VTG
Not need
Course and speed measured over ground
NOTE for NMEA sentences, VHW, VBW, VTG and VDR:
When the VHW sentence is selected, the Doppler Log or a speed log (Magnetic or
Mechanical) can be selected according to the talker device name included in the
sentence.
When the VBW sentence is selected, only the Doppler LOG is selected.
When the VDR sentence is selected, only the Doppler LOG is selected.
When the VTG sentence is selected, the Doppler LOG or the GPS receiver is
selected.
