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Operator's Manual
The window below the wind data provides information relating to your
course and speed. You will find the Course Over Ground(COG calcu-
lated by the MX421 smart GPS antenna), Heading (HDG,yourNMEA
0183 compass input), and Heading To Steer (HTS) data on the left side
of the window. HTS data is calculated by considering your Heading,
minus COG and adding BRG to the waypoint. In doing so, the soft-
ware considers any Set to be included in the HDG value. Ifthere is no
Set, your HDG should be equal to COG. Set and Drift is calculated from
GPS and your Speed Log (NMEA 0183 VHW record or Pulse input)
and Compass (NMEA 0183 HDM, HDT, orVHW) input or an operator
manual input.
Ori
the right side ofthe lower left window you will find the Speed Over
Ground (SOG, calculated by MX42l smart GPS antenna), Speed Log
(LOG, the NMEA 0183 or pulse speed input), and the Waypoint Clo-
sure Velocity (WCV). WCV reflects the real time velocity from your
present position and course towards the next waypoint. The VMG
and WCV are calculated from GPS data. Refer to the diagram below to
see a graphical representation between VMG and WCV.
Velocity Made Good:
-
Neld
Waypoint
-
........ __
BRG
-
Effect of
I
Set & Drift
OriginalCourse Line
Present
Position
SOG 13 Kn
/
Distance to
---~I
Waypoint Travelled
<
Beginnhg
Waypoint
Waypoint Closure Velocity:
Next
Waypoint
Beginnng
Waypoint
Effect of Set
&
Drift
~
Present
Position
SOG 13Kn
WCV 9 Kn
e
Line
,I,
d cou rs
y
E.Jd~_ ~
-:..
~RG
&
RNG
-
-
- -
OriginalCourse Line-1"
WCV is based on
Extended Course
line (COG). SOG.
BRG
&
RNG to WPT
-
...
-....
HTS to
counter
Set
&
Drift
Version 7.5
25
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