LIGHT
WIND
ALARM
TRUE
APP
INFO
2 OPERATION
2.1 Apparent Wind Angle
When the IS12 Analogue Wind instrument is switched on, the
apparent wind angle is shown as an analogue readout (Fig 2.1) -
IS12 Wind Speed/Angle
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Fig 2.1 - Analogue Wind Angle Display
The pointer indicates the direction that the wind is coming
from, relative to the boat (indicated by the “boat shape” on the
fascia). In this example, the wind angle is 45º from the star-
board bow. The wind angle can also be displayed digitally -
see Section 2.5 for further details.
NOTE As a standalone instrument, the Analogue Wind instrument
can only show the apparent wind angle - this is the direction the
wind appears to be coming from, which is distorted by the for-
ward velocity of the boat. In practical terms, this is the correct
wind angle to trim to, but true wind angle and speed informa-
tion can also be displayed if there is input from an IS12 Speed
Log or Combi instrument. See Section 2.4 for more details.
2.2 Apparent Wind Speed
The apparent wind speed is shown on the digital display. This
can be shown in knots, metres/sec, miles per hour or Beaufort
(selected in the Units calibration function - see Section 3.1). A
digital marker indicates the units selected (Fig 2.2).
See note above regarding true wind speed information.
Fig 2.2 - Apparent Wind Speed
Units indicator
