In June 1995 the Texas Historical Commission organized a second magnetometer survey to search high-probability areas not included in earlier surveys. The most important technological development since the original survey was the advent of the differential GPS positioning system, which made navigation and the relocation of targets considerably easier and more accurate. This survey lasted the entire month and utilized a Geometrics 866 proton precession magnetometer which identified 39 "magnetic features that required further investigation". These were prioritized, and on 5 July 1995 divers were sent to the highest priority location.