Leica MX400 Operating Instructions Manual page 41

Operator's Manual
Log - Sets the input port number, sensor type (pulse or NMEA
0183), sensor offset, alarms, and a correction factor (if needed).
Set & Drift - Sets the mode to manual or automatic (derived from
GPS). Sets the time-out before applying calculated values. GPS
calculated values are used prior to the time-out period.
SJB - Configures the Smart Junction Box (SJB), an optional analog
to digital gyro interface converter, for input of compass and
speed log data to the receiver. Refer to the Installation & Service
Manual for full details of the SJB.
Wind - Sets the input port number, units of measure, sensor offset,
alarms, and the input NMEA 0183 record to derive the wind
information from. The NMEA 0183 record should be specified
by the user, because several NMEA 0183 records may contain
wind information. This provides you the capability of knowing
exactly what the wind source is.
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
information is given in relative terms, the receiver calculates true
values using available GPS course and speed information to make
the necessary adjustments. Refer to the Glossary for definitions on
Apparent/True Wind Angle/Speed/Direction. To the right of the
wind information 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 receiver 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
28
Navigate
Version 3.3