Specifications

AIRMAR

PB100 WeatherStation Technical Manual revision 1.007

NMEA 0183 TRANSMITTED SENTENCE

$WIMWD

Summary

NMEA 0183 standard Wind Direction and Speed, with respect to north.

Syntax

$WIMWD,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>*hh<CR><LF>

Fields

<1>

Wind direction, 0.0 to 359.9 degrees True, to the nearest 0.1 degree

<2>

T = True

<3>

Wind direction, 0.0 to 359.9 degrees Magnetic, to the nearest 0.1

degree

<4>

M = Magnetic

<5>

Wind speed, knots, to the nearest 0.1 knot.

<6>

N = Knots

<7>

Wind speed, meters/second, to the nearest 0.1 m/s.

<8>

M = Meters/second

Default State

Enabled. Transmitted once per second.

Notes

The wind speed and direction data provided in this sentence are calculated using

vector math based on the measured apparent wind speed and direction, SOG and

COG from a GPS, compass heading, and magnetic variation. If any of these data

are not available, this sentence shall be transmitted with null fields.

The SOG, COG, and compass heading data used in the calculation may be

provided by the internal GPS (if installed), internal compass (if installed), and/or

from an external compass and GPS. The decision as to which data will be used is

determined by the precedence rules defined in section 2.2.1.

This sentence may be enabled or disabled via the $PAMTC,EN,MWD command.