Maretron Alarm Module ALM100 Manual de usuario descargar pdf (Pagina 94)

9.4.8.3.2 Heading/Course/Bearing

This selection box allows you to decide whether headings, course, and bearing

information are displayed as True (relative to the geographic North Pole) or

Magnetic (relative to the magnetic north pole).

9.4.8.3.3 Wind True Vessel Ref.

“Wind True Vessel Ref.” defines the reference used to calculate the speed and

direction of the wind as if the boat were “stopped”. This global setting determines

whether “stopped” means relative to a point on the ground or to the water.

• Power boaters may prefer to use the “Ground” setting of this parameter.

This gives the speed and direction of the Wind as if the receiver were

sitting on the ground, facing in the same direction as the bow of the boat.

To calculate True wind speed with a Ground reference from the Apparent

Wind requires

o Course over Ground from a GPS (e.g. GPS200)

o Speed over Ground from a GPS (e.g. GPS200)

o Heading from a Compass (e.g. SSC200)

• Sail boaters may prefer to use the “Water” setting. This gives the speed

and direction of the wind as if the receiver were drifting in the water facing

in the same direction as the bow of the boat. To calculate True wind speed

with a Ground reference from the Apparent Wind requires

o Speed though Water from a Log (e.g. DST110)

• The last setting Station should only be used for land-based installations

where there is no movement. This requires no other data, assuming that

all speeds are zero.

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Maretron Alarm Module ALM100 Manual de usuario Pagina 94