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Running Fix

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

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Running Fix

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

  2. RUNNING FIX EXAMPLE 0850 0820 0820-0850 0905 0920 0815 0830 0820 0850 R Fix 0850 0800 LOP LOP 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. 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. Next, parallel your 0820 LOP to where you marked off the distance along the course line. Press the <space bar> to view the next part. Previous Slide Main Menu Next Slide

  3. The Speed Made Good (SMG) is calculated from distance traveled from 0800 to 0815. In our example, 7500 yds over 15 minutes equals 15 kts. The Course Made Good (CMG) is measured from FIX to FIX. In our example, the CMG is 110°T. 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. SET & DRIFT COURSE MADE GOOD SPEED MADE GOOD 0830 0815 0800 7500 yds Drift = .6 kts SMG = 15 kts 0815 CMG is 110°T Set = 160°T Press the <space bar> to view the next part. Previous Slide Main Menu Next Slide

  4. Course to maintain Required Course & Course to regain Original Track Course to Regain Track 1000 0930 0900 Course to maintain required course C - 090°T S - 10 kts 1000 EP 1000 0930 Measure from you 0900 FIX to your 0930 DR. Measure this same distance along your new course line at the 0930 FIX. 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. 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. To plot the course to maintain the required course, mark off the set & drift as shown. Draw from your 0930 fix to this point. Plot your 1000 DR along this DR line. Measure your Set & Drift Vector and parallel this to your new course line at the 1000 DR. Set & Drift Vector Next, draw another course line at 0930 as shown. Press the <space bar> to view the next part. Previous Slide Main Menu Next Slide

  5. Target Angle 270°R TA = TB + 180 - TC 310°T Remember, Target Angle involves the contact’s aspect and course, not your own ship’s. Target Angle is always expressed in degrees RELATIVE. 090°T 000°R 180°R 040°R 090°R TA = 310 - 180 - 090 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. Press the <space bar> to view the next part. Previous Slide Main Menu Next Slide

  6. 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. TA = TB + 180 - TC TA = 240 - 180 - 040 TA = 020°R US 000°R 270°R 040°T 020°R THEM 240°T Press the <space bar> to view the next part. 090°R 180°R Previous Slide Main Menu Next Slide

  7. 000°T 000°T 000°T THEM THEM THEM 000°T 000°T 000°T US 090°T 000°T 270°T US TA = TB + 180 - TC TA = 000 - 180 - 000 TA = -180 + 360 TA = 180°R US 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. Press the <space bar> to view the next part. Previous Slide Main Menu Next Slide

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