The following program will assist you in the areas of Navigation. Choose from below to see the examples graphically illustrated. Running Fix Course Made Good(CMG) & Speed Made Good (SMG) Set & Drift Course to maintain Required Course & Course to regain Original Track Target Angle EXIT PROGRAM

LOP 0820 LOP 0850 Measure the DR distance at the times your LOP’s were plotted. In this case, take the distance between the 0820 to 0850 DR’s. Next, parallel your 0820 LOP to where you marked off the distance along the course line R Fix At 0820, you decide to plot an LOP. At 0850, you decide to plot a 2nd LOP. At 0800, you plot your position. Next, plot your DR’s.Remember that you need to plot your 0820 DR since you plotted your 0820 LOP. Remember that you need to plot your 0850 DR since you plotted your 0850 LOP. Next transfer this distance to the 0820 LOP along the course line as noted below. The interception of the two LOP’s becomes the Running Fix. Note how the running fix is labeled and plotting your DR’s. Press the to view the next part. RUNNING FIX EXAMPLE Next SlideMain MenuPrevious Slide

Set = 160°T Drift =.6 kts To calculate the drift, measure the distance from your 0815 DR to the 0815 FIX and the time between fixes, you should be able to calculate your drift in KNOTS. In our example, the distance is 300 yds over a 15 min interval. Using the three minute rule or your nautical slide rule, you should get.6 kts. To measure the Set, plot from your DR to your FIX. The Set will be expressed in degrees true. In our example, the Set was 160°T. The Course Made Good (CMG) is measured from FIX to FIX. In our example, the CMG is 110°T. The Speed Made Good (SMG) is calculated from distance traveled from 0800 to In our example, 7500 yds over 15 minutes equals 15 kts. CMG is 110°T 7500 yds SMG = 15 kts 0830 SET & DRIFT COURSE MADE GOOD SPEED MADE GOOD Press the to view the next part. Next SlideMain MenuPrevious Slide

Press the to view the next part. Next SlideMain MenuPrevious Slide Set & Drift Vector C - 090°T S - 10 kts Course to Regain Track Course to maintain required course Course to maintain Required Course & Course to regain Original Track This example will show you how to determine what course you must steer to maintain a required course and how to regain your original track. Next, draw another course line at 0930 as shown. Measure your Set & Drift Vector and parallel this to your new course line at the 1000 DR To plot the course to maintain the required course, mark off the set & drift as shown. Next, draw your required course from your 0930 fix to where you marked off the set & drift. This is your Estimated Position (EP). To regain your original track, you must mark off the set & drift twice as shown. Draw from your 0930 fix to this point. Plot your 1000 DR along this DR line Measure from you 0900 FIX to your 0930 DR. Measure this same distance along your new course line at the 0930 FIX EP

Target Angle TA = TB TC 310°T 090°T Remember, Target Angle involves the contact’s aspect and course, not your own ship’s. Target Angle is always expressed in degrees RELATIVE. TA = TA = 040°R To visualize Target Angle, place yourself on the other ship and look back at yourself and see what you bear in degrees relative. 000°R 090°R 180°R 270°R 040°R Next SlideMain MenuPrevious Slide Press the to view the next part.

240°T TA = TB TC TA = TA = 020°R 040°T 000°R 090°R 180°R 270°R 020°R Once again, to visualize Target Angle, place yourself on the other ship and look back at yourself and see what you bear in degrees relative. Remember, our heading doesn’t affect their Target Angle. US THEM Next SlideMain MenuPrevious Slide Press the to view the next part.

US THEM TA = TB TC TA = TA = TA = 180°R 000°T 090°T 000°T270°T 000°T Please note that in these three examples, our course has nothing to do with the contact’s Target Angle. The formula for TA doesn’t involve our Ship’s Head. Next SlideMain MenuPrevious Slide Press the to view the next part.