Operation and Installation CD401MR-SC
Date: 2022-09-26Page 18 of 48
Speed
The NMEA sentence VBW is supported for receiving information about the speed
through water and speed over ground (bottom) for longitudinal, transverse and transverse
aft. The NMEA sentences VHW and VTG are supported for receiving information about
relative speed.
• An arrow, indicating the direction, is added in front of the value for speed values
from the NMEA sentences VBW.In the case of 2 VBW messages from separate
SOG and STW sensors, both can be used as long as the unused elds are left blank.
(DL21, EML and SL1200 etc.)
• The relative is fetched from the NMEA sentence VHW.
• The relative speed over ground is fetched from the NMEA sentence VTG.
• Speed value in km/h is converted to knots if speed value in knots is not available.
• Relative speed is displayed without arrows.
• All speed values are displayed in knots with either one or two decimals depending
of the congured parameter to display. STW2L, STW2T, SOG2L and SOG2T will
always display speed below 10 knots with two decimals and speed from 10 knots
and above with one decimal. All other speed parameters are displayed with one
decimal (see the detailed description of the parameters in Appendix 2). Maximum
speed value to be displayed is +/- 99.9 knots.
screen:
Runtime
screen:
T
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