2.4 True Wind Angle & Speed
The Analogue Wind instrument can also show true wind angle
and wind speed information, but boat speed information will
be required in order for this to be calculated, which can be sup-
plied by an IS12 Speed Log or Combi instrument (Fig 2.4) -
IS12 Wind Speed/Angle
10
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When boat speed data is supplied to the Analogue Wind
instrument, pressing the TRUE/APP key will toggle between
Apparent Wind Angle/Speed and True Wind Angle/Speed
display. The arrow on the LCD display will point to either
APP or TRUE indicating which type of data is currently being
displayed (Fig 2.5) -
Fig 2.4 - Minimum IS12 System for True Wind Data
Speed Log/Combi Analogue Wind
Masthead
Transducer
Speed
Transducer
LIGHT
WIND
ALARM
TRUE
APP
INFO
LIGHT
WIND
ALARM
TRUE
APP
INFO
Apparent
Wind Mode
True
Wind Mode
Fig 2.5 - Apparent and True Wind Mode Indicators
