59° 58° 5r 56° 55° 54° 53° 52° 51° 50° 49° 



47° 46° 45° 44° 



59° 58° 57° 56° 55° 54° 53° 52° 51° 50° 49° 48' 47° 46° 45° 44° 43° 



Figure 1.— Chart showing general In-Patrol area, principal region of activity (within solid black lino), critical area (shaded), and the steimjr tracks as prescribed by North Atlantic Track agreements as revised, 1931. 

 149346—88 (Face p. 1) 



