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Find CURRENT or the SET AND DRIFT

Find CURRENT or the SET AND DRIFT. K Stepnitz 2-2010. Find CURRENT or the SET AND DRIFT You can recognize this type of problem by the form of the answers. 089°T 1.2knots. x. Find your starting point. x. Find your starting point. 0900. x.

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Find CURRENT or the SET AND DRIFT

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  1. Find CURRENT or the SET AND DRIFT K Stepnitz 2-2010

  2. Find CURRENT or the SET AND DRIFT You can recognize this type of problem by the form of the answers. 089°T 1.2knots

  3. x Find your starting point

  4. x Find your starting point 0900

  5. x Draw in your DR LINE which is your INTENDED course. This is the line that you THINK the boat is following over the ground. DR 0900 x

  6. x x Plot your FIX as given in the problem. DR 0900 x

  7. x x Plot your FIX as given in the problem. DR 0945 0900 x

  8. x x Draw in your TRACK LINE. This is the path over the ground that the boat is ACTUALLY following. DR TRACK 0945 0900 x

  9. IMPORTANT NOTE!!!!!!!!! From this point on in the problem, ALL POINTS PLOTTED ARE ON THE DR LINE

  10. x x Find out where you THOUGHT you would have been at (in this case 0945) the time the FIX was taken. DR TRACK 0945 0900 x

  11. x x Find out where you THOUGHT you would have been at (in this case 0945) the time the FIX was taken. To do this use DSTreet D=S*T S=BOAT SPEED T=ELAPSED TIME 45minutes or 0.75 hr. in this example. Due to boat speed alone, the boat would be somewhere on this CIRCLE having a radius of the D found. DR TRACK 0945 0900 x

  12. 0945 x x Find out where you THOUGHT you would have been at (in this case 0945) the time the FIX was taken. To do this use DSTreet D=S*T S=BOAT SPEED T=ELAPSED TIME 45minutes or 0.75 hr. in this example. This point is measured from the starting point ALONG THE DR LINE DR TRACK 0945 0900 x

  13. 0945 x x Complete the triangle by connecting the DR position charted to the FIX. Notice that they are both at 0945. DR TRACK 0945 0900 x

  14. 0945 x x Complete the triangle by connecting the DR position charted to the FIX. The boat has been pushed from where you wanted to be (the DR line) to its actual position on the Track. This is the direction of the current or the SET DR TRACK PUSH 0945 0900 x

  15. 0945 x x Complete the triangle by connecting the DR position charted to the FIX. The boat has been pushed from where you wanted to be (the DR line) to its actual position on the Track. This is the direction of the current or the SET DR TRACK PUSH 0945 0900 x READ THIS SIDE OF THE COMPASS

  16. 0945 x x Complete the triangle by connecting the DR position charted to the FIX. The boat has been pushed from where you wanted to be (the DR line) to its actual position on the Track. This is the direction of the current or the SET DR TRACK 0945 0900 x

  17. 0945 x x Complete the triangle by connecting the DR position charted to the FIX. The boat has been pushed from where you wanted to be (the DR line) to its actual position on the Track. This is the direction of the current or the SET In this case 115°T DR TRACK 0945 0900 x

  18. 0945 x x Now we want to find the speed or DRIFT. There are two ways to do this. The first is by plotting. The second uses DSTreet. DR TRACK 0945 0900 x

  19. 0945 x x To use the PLOTTING METHOD we need to draw a second triangle. DR TRACK 0945 0900 x

  20. 0945 x x To use the PLOTTING METHOD we need to draw a second triangle. To do this use DSTreet D=S*T S=BOAT SPEED T= ONE HOUR This will tell us where we THOUGHT we would be in ONE HOUR. REMEMBER that this is plotted on the DR LINE DR TRACK 1000 0945 0900 x

  21. 0945 x x To use the PLOTTING METHOD we need to draw a second triangle. Place the parallel rule on the SET LINE found previously and walk this angle to the ONE HOUR DR position. Draw a line connecting the DR line to the TRACK line. DR TRACK 1000 0945 0900 x

  22. 0945 x x To use the PLOTTING METHOD we need to draw a second triangle. Place the parallel rule on the SET LINE found previously and walk this angle to the ONE HOUR DR position. Measure the distance (D) along this line. MEASURE THIS DISTANCE DR TRACK 1000 0945 0900 x

  23. 0945 x x To use the PLOTTING METHOD we need to draw a second triangle. Use this value of D and ONE HOUR for T to find the DRIFT MEASURE THIS DISTANCE DR TRACK 1000 0945 0900 x

  24. 0945 x x The second method for finding the speed or DRIFT is a calculation using DSTreet. DR TRACK 0945 0900 x

  25. 0945 x x The second method for finding the speed or DRIFT is a calculation using DSTreet. It is important to remember that each leg of the triangle represents what happened in the same ELAPSED TIME! DR TRACK 0945 0900 x

  26. 0945 x x The second method for finding the speed or DRIFT is a calculation using DSTreet. In this solution the BLUE line represents the CURRENT DR TRACK 0945 0900 x

  27. 0945 x x The second method for finding the speed or DRIFT is a calculation using DSTreet. In this solution the BLUE line represents the CURRENT Measure the distance between the point on the DR-Line and the FIX position. MEASURE THIS DISTANCE DR TRACK 0945 0900 x

  28. 0945 x x The second method for finding the speed or DRIFT is a calculation using DSTreet. In this solution the BLUE line represents the CURRENT Measure the distance between the point on the DR-Line and the FIX position. In our DSTreet; D = this distance T = ELAPSED TIME (0.75 in this problem) MEASURE THIS DISTANCE DR TRACK 0945 0900 x

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