Path-planning saves time

Head and tail current situations are great times to assess your glider speed relative to the water.  At the 4 am surfacing, the currrent direction and Scarlet's flight path were both within 2 degrees of each other.  We made nearly 10 km in the 8 hour segment, with a breakdown that looks like 2/3 Scarlet (6 km/8 hours) and 1/3 ocean (4 km/8 hours).  If that holds for a full day, Scarlet is making 18 km/day by herself and 30 km/day if you add in the boost from the ocean currents.  If we stay at this radius in the eddy, and continue to use its clockwise swirl velocity, we can cover the 210 km loop to 16.5 W in about 7 days at 30 km/day.  If we try to go straight across the eddy using only Scarlet's own speed, the shorter distance is 165 km, but it now takes 9 days at 18 km/day.  Going around the longer loop to the north to take advatage of the eddy swirl velocity saves us 2 days. 

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