Difference between revisions of "TrueWind"
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== calculate True Wind from Apparent Wind == | == calculate True Wind from Apparent Wind == | ||
| − | * AWA Apparent Wind Angle (relative to H) | + | * <b>AWA</b> Apparent Wind Angle (relative to H) |
| − | * H Heading (relative to true north) | + | * <b>H</b> Heading (relative to true north) |
| − | ** AWD Apparent Wind Direction (relative to true north) | + | ** <b>AWD</b> Apparent Wind Direction (relative to true north) |
** <code>AWD = MOD(H+AWA;360)</code> | ** <code>AWD = MOD(H+AWA;360)</code> | ||
| − | * AWS Apparent Wind Speed | + | * <b>AWS</b> Apparent Wind Speed |
| − | * COG Course Over Ground | + | * <b>COG</b> Course Over Ground |
| − | * SOG Speed Over Ground | + | * <b>SOG</b> Speed Over Ground |
| − | * STW Speed Trough Water | + | * <b>STW</b> Speed Trough Water |
| − | ** TWS True Wind Speed | + | ** <b>TWS</b> True Wind Speed (relative to ground) |
** <code>TWSx = SOG * Sin (COG) - AWS * Sin (AWD)</code> | ** <code>TWSx = SOG * Sin (COG) - AWS * Sin (AWD)</code> | ||
** <code>TWSy = SOG * Cos (COG) - AWS * Cos (AWD)</code> | ** <code>TWSy = SOG * Cos (COG) - AWS * Cos (AWD)</code> | ||
** <code>TWS= SQRT (TWSx*TWSx + TWSy*TWSy)</code> | ** <code>TWS= SQRT (TWSx*TWSx + TWSy*TWSy)</code> | ||
| + | ** <b>TWD</b> True Wind Direction (relative to true north) | ||
| + | ** <code>TWD = ATAN ( TWSx / TWSy )</code> | ||
== see also == | == see also == | ||
Revision as of 14:10, 29 October 2018
calculate True Wind from Apparent Wind
- AWA Apparent Wind Angle (relative to H)
- H Heading (relative to true north)
- AWD Apparent Wind Direction (relative to true north)
AWD = MOD(H+AWA;360)
- AWS Apparent Wind Speed
- COG Course Over Ground
- SOG Speed Over Ground
- STW Speed Trough Water
- TWS True Wind Speed (relative to ground)
TWSx = SOG * Sin (COG) - AWS * Sin (AWD)TWSy = SOG * Cos (COG) - AWS * Cos (AWD)TWS= SQRT (TWSx*TWSx + TWSy*TWSy)- TWD True Wind Direction (relative to true north)
TWD = ATAN ( TWSx / TWSy )
