TABLE 3. [Page 107 
Difference of Latitude and Departure for 45° (135°, 225°, 315°). 
DOH RISOWRON| COP RWON OOH 
In Plane Sailing. 
For converting Dep. into Dif’. Long. and Diff. Long. into Dep. 
In Middle Latitude Sone: wy Y 2 
For converting Dep. into Diff. Long. and Diff. Long.into Dep. 
In Mercator Sailing. 
NxCos. | NxSin. 
Side Side 
Adj. Opp. 
For multiplication of numbers by sines and by cosines, or 
solution of plane right-angled triangles. 
