latitudes even a small eddy, once found by any technique, 



might be tracked by a system with marginal resolution. 



It is necessary to point out, however, that a knowledge 



of atmospheric pressure would be crucial in this program. 



A 10 mb weather disturbance will have a topography identical 



to a 10 cm isobaric disturbance caused by an oceanographic 



eddy. 



One further point deserves mention. Present discussions 

 suggest that the Geos - C satellites will be launched into 

 orbits having inclinations of perhaps 50*^ to 60°. This 

 inclination, while quite appropriate, will place the 

 satellites systematically over the higher portions of 

 the ocean, as can be seen on Stommel's map (Fig. 1). If 

 an accurate determination of the absolute position of the 

 Geoid is desired, this difference should be taken into 

 consideration. 



ACKNOWLEDGMENTS 



The preparation of this article was supported in part by the 

 Office of Naval Research. 



24-15 



