TABLE 3. 
Difference of Latitude and Departure for 2° (178°, 182°, 358°). 
In Plane Sailing. 
For converting Dep.into Diff. Heo: and Diff. Long.into Dep. 
In Middle Latitude Sailing. 
For converting Dep.into Diff. Long. and Diff. Long.into Dep. 
In Mercator Sailing. 
For multiplication of numbers by sines and by cosines, or ~ 
solution of plane right-angled triangles. pivpote; pide 
