Question #2
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My group is trying to account for winds looking at the speed of our ship. We have found the Ug and Vg components 
of the wind but are unsure if we need to look at each component separately to determine if wind is helping or hurting us? 
Do we need to take 90% of these components to get actual wind and not geostrophic wind? 


Answer to #2
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At the very least you need to make sure the actual wind speed is 90% less than the geostrophic wind speed. You
can also take into account friction for the low-level winds by assuming friction shifts the wind direction
30 degrees from the geostrophic direction, across the local contours, directed toward low pressure. You can then
use the dot product between your actual wind vector and the ship propagation vector to determine the projection of 
the actual wind onto the direction of ship travel. If the projected actual wind and ship propagation vectors are in 
the same direction, you can add the wind component in the direction of travel. If the two vectors are opposite, you 
subtract the wind component opposite to the direction of travel from the ship's top speed.


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