would be acceptable at sea. Use the correct values for your own course and speed and the best estimated values for the guide's 

 course and speed, which is not often exactly known. 



When in formations, cultivate the habit of having the position of all units plotted on the Maneuvering Board, with the 

 formation guide at the center. This removes doubt as to the location of those units which may interfere with the expeditious 

 changing of your own station as well as permits a more rapid solution of the problem presented. The value of this habit, 

 especially when on the scouting line, cannot be overestimated. A rough sketch on plain paper may assist in choosing the 

 proper scale for plotting the formation. 



The use of accurate parallel rulers and a sharp pencil will aid in neatness and clarity. If, however, no parallel rulers are 

 available, two drafting triangles will suffice. 



When determining the point of tangency between a line and a circle, estimating by eye is insufficient. Determine the direc- 

 tion of the tangent, add or subtract 90° and lay off this direction from the center of the circle. Its intersection with the original 

 line will determine the point of tangency. 



Follow the latest practice of using three-figure numbers for courses or bearings. If a decimal part of an hour or mile is 

 to be indicated, place a zero before the decimal point. All courses or bearings are true unless otherwise indicated. 



Finally, remember that while the maneuvering unit travels along the Kelative Movement Line, its heading coincides with 

 this line only in the special case in which the course of the maneuvering unit is the same as the guide's course. In other words, 

 the maneuvering unit generally travels along the Relative Movement Line "crab fashion." 

 VI 



