NorthStar MX500 Operator's & Installation Manual page 42

Operator's Manual
Log - Sets the input port number, sensor type (pulse or NMEA 0183),
Set & Drift - automatically calculated based on GPS derived values.
Wind - Sets the input port number, units of measure, sensor offset,
This screen is divided into four windows. The window on the top left
provides details relating to the True Wind Angle (TWA), True Wind
Speed (TWS) and True Wind Direction (TWD), which are taken
from the NMEA 0183 record of MWV or VWR. If the wind infor-
mation is given in relative terms, the CDU calculates true values
using available GPS course and speed information to make the nec-
essary adjustments. Refer to the Glossary for definitions on Appar-
ent/True Wind Angle/Speed/Direction. To the right of the wind in-
formation is your Velocity Made Good (VMG) towards the waypoint.
The VMG data is filtered to show the average speed from the last
waypoint to your present position towards the next waypoint. VMG
is calculated from GPS data. The CDU will also use the above data
to calculate your speed parallel to wind and can output the VPW
NMEA 0183 data sentence to other on-board instruments.
The window below the wind data provides information relating to
your course and speed. You will find the Course Over Ground (COG
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0183 records may contain depth information. This provides you
the capability of knowing the depth source exactly.
alarms, and a correction factor (if needed).
alarms, and the input NMEA 0183 record from which to derive
the wind information. The NMEA 0183 record should be speci-
fied by the user, because several NMEA 0183 records may con-
tain wind information. This provides you the capability of know-
ing the wind source exactly.
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