Difference between revisions of "TrueWind"
(→calculate True Wind from Apparent Wind) |
(→calculate True Wind from Apparent Wind) |
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** <code>TWD = ATAN ( TWSx / TWSy )</code> | ** <code>TWD = ATAN ( TWSx / TWSy )</code> | ||
* <b>STW</b> Speed Trough Water | * <b>STW</b> Speed Trough Water | ||
| − | ** DFT Current Drift (relative to ground) | + | ** <b>DFT</b> Current Drift (relative to ground) |
** <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> | ||
| − | ** SET Current Set (relative to true north) | + | ** <b>SET</b> Current Set (relative to true north) |
** <code>SET = ATAN ( DFTx / DFTy )</code> | ** <code>SET = ATAN ( DFTx / DFTy )</code> | ||
Revision as of 14:19, 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
- 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 )
