established. Figure III-l identifies three of the more common methods of es- 

 tablishing a position fix. 



In addition to these three techniques, doppler and inertial methods of 

 navigation are becoming increasingly important . Both methods are capable of 

 continuously plotting a vessel's position with respect to a fixed reference point. 



Q. TWO ANGLES AND THE INCLUDED SIDE = TRIANGULATION OR DIRECTION FINDING, 

 b. TWO SIDES AND THE INCLUDED ANGLE = RADAR OR RHO-THETA METHOD. 

 C. THREE SIDES = TRILATERATION. 



FIGURE III-l 



POSITION FIX GEOMETRY 



12 



artbiir ai.lttttlejnr. 



