Chris Scott;
LKP 2°58.8'N 30°35.4'W
V/S ...sighted June 6 @ 13h38 @ 3.61°N 30.62°W (Brazilian)
V/S recovered June 7 @ 18h35 @ 3.47°N 30.68°W (Brazilian)
I don't think that getting into semantics about where and when the V/S was at any given time is going to help matters much at this time. My opinion on the published sighting position is (like some others I come across) that it has suffered from transcription errors. Using that assumption, I believe that the most likely sighting position was 3.41°N 30.62°W, and the recovered position was 3.47°N 30.68°W which is 305°T x 4.5NM from the earlier position. That gives a drift rate of 4.5 x 1852 = 8334m / (29 x 60 x 60) = 8cm/sec in little or no wind, so will equate closely to the current over the period. Is this plausible? Probably better than possibly.