Difference between revisions of "TrueWind"

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(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 )

see also