Difference between revisions of "TrueWind"
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== calculate True Wind from Apparent Wind == | == calculate True Wind from Apparent Wind == | ||
| − | * <b>AWA</b> Apparent Wind Angle (relative to H) | + | * <b>AWA</b> Apparent Wind Angle (relative to H) <b>environment.wind.angleApparent</b> |
| − | * <b>H</b> Heading (relative to true north) | + | * <b>H</b> Heading (relative to true north) <b></b> |
| − | ** <b>AWD</b> Apparent Wind Direction (relative to true north) | + | ** <b>AWD</b> Apparent Wind Direction (relative to true north) <b></b> |
** <code>AWD = MOD(H+AWA;360)</code> | ** <code>AWD = MOD(H+AWA;360)</code> | ||
| − | * <b>AWS</b> Apparent Wind Speed | + | * <b>AWS</b> Apparent Wind Speed <b>environment.wind.speedApparent</b> |
* <b>COG</b> Course Over Ground | * <b>COG</b> Course Over Ground | ||
| − | * <b>SOG</b> Speed Over Ground | + | * <b>SOG</b> Speed Over Ground <b>navigation.speedOverGround</b> |
| − | ** <b>TWS</b> True Wind Speed (relative to ground) | + | ** <b>TWS</b> True Wind Speed (relative to ground) <b></b> |
** <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) | + | ** <b>TWD</b> True Wind Direction (relative to true north) <b></b> |
** <code>TWD = ATAN ( TWSx / TWSy )</code> | ** <code>TWD = ATAN ( TWSx / TWSy )</code> | ||
| − | * <b>STW</b> Speed Trough Water | + | * <b>STW</b> Speed Trough Water <b></b> |
| − | ** <b>DFT</b> Current Drift (relative to ground) | + | ** <b>DFT</b> Current Drift (relative to ground) <b></b> |
** <code>DFTx = SOG * Sin (COG) - STW * Sin (H)</code> | ** <code>DFTx = SOG * Sin (COG) - STW * Sin (H)</code> | ||
** <code>DFTy = SOG * Cos (COG) - STW * Cos (H)</code> | ** <code>DFTy = SOG * Cos (COG) - STW * Cos (H)</code> | ||
** <code>TWS= SQRT (DFTx*DFTx + DFTy*DFTy)</code> | ** <code>TWS= SQRT (DFTx*DFTx + DFTy*DFTy)</code> | ||
| − | ** <b>SET</b> Current Set (relative to true north) | + | ** <b>SET</b> Current Set (relative to true north) <b></b> |
** <code>SET = ATAN ( DFTx / DFTy )</code> | ** <code>SET = ATAN ( DFTx / DFTy )</code> | ||
Revision as of 16:18, 29 October 2018
calculate True Wind from Apparent Wind
- AWA Apparent Wind Angle (relative to H) environment.wind.angleApparent
- H Heading (relative to true north)
- AWD Apparent Wind Direction (relative to true north)
AWD = MOD(H+AWA;360)
- AWS Apparent Wind Speed environment.wind.speedApparent
- COG Course Over Ground
- SOG Speed Over Ground navigation.speedOverGround
- 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 )
- STW Speed Trough Water
- DFT Current Drift (relative to ground)
DFTx = SOG * Sin (COG) - STW * Sin (H)DFTy = SOG * Cos (COG) - STW * Cos (H)TWS= SQRT (DFTx*DFTx + DFTy*DFTy)- SET Current Set (relative to true north)
SET = ATAN ( DFTx / DFTy )
