REMARKS:  This enhanced Landsat-8 image shows an anomaly located 80 km northwest of San Juan, Puerto Rico.  The anomaly is 10 km long, up to 0.5 km at its widest point and is oriented from northwest to southeast. 

The anomaly is not attached to a point source but a ship was detected in the same satellite image 38.5 km to the northwest of San Juan and 41.5 km southeast of the center of the anomaly. Based on the wake, the ship was moving towards the southeast, or towards 110 degrees.

Sky conditions were partly cloudy and winds were from the northeast and east at 10 knots.