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requires no user configuration. However, some of the WSO100 parameters are user
configurable as described below:
• Installation Offset – As shipped from the factory, the WSO100 will read 0° apparent
wind direction when the wind blows into the sensor directly from the direction of the post
nearest the black humidity sensor that protrudes from the bottom of the sensor. If the
WSO100 is mounted with this post facing directly towards the bow of the boat, no
adjustment is necessary; however, if the sensor is mounted in any other orientation, the
installation offset can be used to compensate the apparent wind direction reading such
that it will read 0° when the apparent wind is blowing directly into the bow of the vessel.
• Wind Speed Damping Period – As shipped from the factory, the WSO100 uses a
damping period of 1.5 seconds to filter short-term variations in wind speed and direction
and provide a more stable, usable output. This damping period can be changed by the
user to increase or decrease the amount of filtering.
• Periodic Rate of Transmission – As shipped from the factory, the WSO100 transmits
PGNs at a periodic rate. Alternatively, a PGN can be disabled by programming its
periodic rate to zero.
These parameters may be configured using a Maretron instrumentation display, such as the
Maretron DSM200, or other NMEA 2000
WSO100 configuration capability. Please refer to your chartplotter/display manual for details.
Users with direct access to the NMEA 2000
through the NMEA 2000
®
2000
messages used to configure these parameters.
3.1 Ultrasonic Wind Speed Sensing
The wind speed measurement portion of the WSO100 consists of three ultrasonic transducers
spaced equally around a horizontally-aligned circle.
The wind speed is measured by measuring the time of flight of an ultrasonic sound pulse
generated by one sensor and received by the other two sensors. Each of the three sensors
takes a turn at being the transmitter, which the remaining two sensors receive the pulse. Wind
blowing in the direction of flight of a pulse increases the speed of the pulse by the amount of
the wind speed. Measuring the time of flight in both directions between a given pair of
transducers allows the speed of sound to be cancelled out of the calculation, making the wind
speed computation independent of air temperature and relative humidity.
The ultrasonic transducers are robust, yet sensitive instruments. The transducers themselves
must be kept free of any coating, such as paint. The WSO100 unit itself, especially the area
between the transducers, must be kept clean and free of debris for maximum wind speed and
direction accuracy.
Revision 1.2
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®
interface. Please refer to Appendix A for a description of the NMEA
®
chartplotters or instrumentation displays with
interface may configure these parameters directly
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