DATA COLLECTION MP REDUCTION 



Navigation 



All navigation for the tracks shown in Figure 2 with the excep- 

 tion of 12 through 15 was controlled by satellite fixes. Accuracy 

 for these tracks is estimated to be within +1.0 km. The older tracks 

 (12 - 15) were controlled with a combination of dead reckoning, 

 celestial fixes, and Loran-A. Accuracy for these tracks is estimated 

 to be within + 15 km. 



Bath3Tnetry 



The compilation of the bathymetry shown in Figure 2 has been 

 discussed by Bracey (1975). His statement that the chart should be 

 regarded as a generalization is emphasized. Even with the limited 

 additional bathymetric data collected since the publication of Bracey 's 

 chart, an accurate, detailed depiction of the bathjnnetry of the area 

 is impossible. 



Seismic Epicenters 



Epicenter information for the period 1961 - 1971 was furnished 

 by the National Earthquake Information Center, National Oceanic and 

 Atmospheric Administration. All events are shown, with no restrictions 

 on the quality of the epicenters, and are only intended to show the 

 general distribution of seismic activity in the area today. 



Seismic Reflection 



Seismic reflection data shown in this report were collected with 

 a sparker sub-bottom profiling system in the case of the NAVOCEANO 



