Airmar LB150 User Manual
Page 36
LB150 WeatherStation Technical Manual revision 0.013
Proprietary and Confidential
PRELIMINARY - DRAFT
33
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NMEA 0183 RECEIVED SENTENCE
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$--
VHW
Summary
NMEA 0183 standard Water Speed and Heading.
Syntax
$--VHW,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>*hh<CR><LF>
Fields
<1>
Compass Heading, degrees True
<2>
T = true
<3>
Compass Heading, degrees Magnetic
<4>
M = magnetic
<5>
Water speed, knots
<6>
N = knots
<7>
Water speed, km/h
<8>
K = km/h
Notes
This sentence is used to obtain water speed from an Airmar® Smart™ speed
sensor. The water speed data is used to calculate true wind relative to the water.
The compass heading fields in this sentence are ignored by the LB150
WeatherStation.
See section 2.2.1. for precedence rules regarding data received via this sentence.