They will use GPS for positioning the profiles. In a second phase of the survey the gravimeter, digital depth sounder, and magnetometer will be transferred to a smaller vessel to map the near-shore gravity and magnetic fields. The deep-water phase of the gravity survey was completed on October 8. The ship's tracks are shown on the accompanying map. A total of 3809 line kilometres of gravity data was collected.
Initial results indicate that gravity gradients associated with the crater margin have been mapped.
The near-shore survey is expected to take fourteen days. Magnetic data could not be collected as the magnetometer fish was lost at sea during mobilization. On a more positive note, the seismic survey was completed as planned. Final Update on the Chicxulub Gravity Survey - November, 1996. A total of 1300 line kilometres of nearshore track data was collected by the Geodetic team.