Using a name or a short explanation to identify a feature on the body of 

 the map is better than using a symbol which must be explained in the legend. It 

 is tiresome for the map reader to have to refer frequently to a legend in order 

 to understand the map. Explanatory notes at the approximate location of the 

 feature to which they refer can hardly be misconstrued and are less diverting 

 than the seesaw reference to a legend. 



(5) Geographic references- — On a map which is well-planned and correctly 

 drafted, it is not difficult to describe the location of any feature shown or to plot 

 accurately new points of control. In other words, the map base should contain 

 all the reference lines necessary for these operations. In subsurface work it is 

 annoying to work on a map, of which base consists of only geographic coordin- 

 ates (meridians and parallels). 



TOWNSHIPS 



U.S.A. 



CANADA 



U.S.A. 



SECTIONS 



// 



13 



CANADA 



14 



12 j 



5 I 6 



4 | 3 

 I 



IS 



16 



B- 



IO | 9 



7 



8 

 i 



-4- 1 



Figure 24-57. Plats showing subdivisions of United States and Canadian 

 townships and sections. 



528 



