12-19-2012, 12:16 PM
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#81
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Guru
City: SF Bay Area
Vessel Model: Tollycraft 34' Tri Cabin
Join Date: Feb 2011
Posts: 12,569
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Quote:
Originally Posted by Baker
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Exact 90 degree (any degree less or more will also somewhat alter SOG results) cross current affects "straight line" SOG (point A to point B) in that you must tack an extent (length and duration of tack depends on cross current speed) to stay on course to reach point B from point A. This means you traveled a somewhat (a little bit) further in total "over land" distance. Therefore the comparison of SOG calculated if traveling on a straight line from A to B would be faster than equivalent "straight line" SOG from point A to B when tacking due to cross current. All comparisons are figuring no wind whatsoever.
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