O 
l— ■ I— i— i_> IL» I— U I—* U 
f— 1 et O (D p P CD P I—I |—i hcj ct 
w p Pi—« cd œ h* p h* 
P et |—'O 
^ M P 
I 
STATUS OF FIELD OPERATIONS - WORLDWIDE SATELLITE TRIANGULATION 
(As of May , 1968) 
Fig. 2