3-2-1
ST290 Instrument System Owner’s Handbook
Chapter 2: Wind instruments
2.1 Introduction
The ST290 Wind and Close Hauled Wind instruments each comprise an
analogue dial and integral digital display. The instruments provide:
• TrueandApparentwinddirectionand speed.Windspeedis displayed
either in knots or meters per second.
• Velocity made good (VMG), when boat-speed information is avail-
able on the system.
• Maximum wind speed.
• Tack angle.
In addition to the units shown above, theWindinstrumentcan show wind
force as Beaufort scale values.
Figure 2-1: ST290 Wind and Close Hauled Wind instruments
Displayed information
The information on the Wind and Close Hauled Windinstruments can be
either true or apparent, depending on which mode you select at the
instrument.
Pointer
The pointer shows the true or apparent wind direction. The scale range
given by the Wind instrument is a full 360
° , whereas the Close Hauled
Wind instrument gives an expanded indication from -60
° to +60° about
the bow or stern of the boat.
D5369-1
81183_2 S3.book Page 1 Tuesday, May 6, 2003 8:41 AM
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