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| What is the difference between true wind referenced to ground speed and true wind referenced to water speed? |
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Article Details
Last Updated:
January 30, 2011
Article ID:
12
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True wind is computed by subtracting the vessel speed from the apparent wind. The vessel speed is either referenced to the water (Speed Through Water (STW)) or the vessel speed is referenced to the ground (Speed Over Ground SOG)). If the STW is subtracted from the apparent wind, then the computed true wind is said to be referenced to water speed. True wind referenced to water speed is usually used by sailors since they are concerned with how fast they are moving through the water. If the SOG is subtracted from the apparent wind, then the computed true wind is said to be referenced to ground speed. True wind referenced to ground speed is usually used by power boaters since they are generally concerned with how fast the wind is blowing referenced to ground speed.
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