36 



A MANUAL FOR NORTHERN WOODSMEN 



been run out and the latitude and departure computed, as 

 given. The result shows that the point reached is north 



FIGURED LATITUDES AND DEPARTURES 



and east of the starting point, much further north than 

 east; hence a course somewhat west of south 

 must be set to reach it. In the figure E X 

 represents the latitude reached and A X the 

 departure. 



Now to find the bearing of E A we have 



tan. A E X = 



.3411. 



AX 7.17 

 WX~ 21.02 



A E X from the table of tangents =18 50'. 

 S 18 50' W is therefore the bearing required. 

 S The length of E A may also be found, since 

 it is the hypothenuse of a right angled tri- 

 angle whose base and altitude are the latitude and de- 

 parture given. 



22.21, 



the distance required. That this value and that for the 

 angle differ somewhat from the true ones is due to the 

 errors of compass surveying. 



In a similar way the course and distance of an inacces- 

 sible line may be computed or omissions supplied in notes. 



