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Lesson 9: Running Fixes. Lesson 8: Running Fixes. AGENDA: Definition of Running Fix Advancing non-simultaneous LOP’s. Plotting/labeling running fixes. Determining an EP. Applicable reading: Hobbs pg. 138-147. Learning Objectives:. Upon completion of this lesson, the student will:

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Presentation Transcript
slide2

Lesson 8: Running Fixes

  • AGENDA:
    • Definition of Running Fix
    • Advancing non-simultaneous LOP’s.
    • Plotting/labeling running fixes.
    • Determining an EP.
  • Applicable reading: Hobbs pg. 138-147.
learning objectives
Learning Objectives:

Upon completion of this lesson, the student will:

  • Apply correct procedures for advancing two or more non-simultaneous, nonparallel lines of position to establish a running fix.

Applicable Reading: Hobbs, pp. 138-142

learning objectives4
Learning Objectives:

Upon completion of this lesson, the student will:

  • Apply correct procedures to plot and label a running fix with bearings on different objects, a running fix with bearings on the same object and a running fix advancing a distance circle of position.
  • Comprehend the reliability of running fixes compared to simultaneous fixes.
slide5

Running Fixes

  • Running Fix - A position determined by crossing non-simultaneous lines of position (LOP’s) that are advanced or retired to a common time.

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NOTE: NOT TO SCALE

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Tank

Running FIX

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STEP #1:

  • Take a bearing to the Nav Aid and draw on the chart.
  • Plot your associated DR position.

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STEP #2:

  • Take a second bearing and plot it.
  • Plot your associated DR position.

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slide8

Procedures for Advancing an LOP

STEP #3

  • Determine distance traveled between the DR’s associated with your two LOP’s.
  • Draw a construct line your DR course.
  • Terminate line @ distance = DR1  DR2
  • Parallel the first LOP through this point
  • Label this advanced LOP with both the original time and the time it was advanced.
slide9

Tank

Running FIX

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20 min @ 12 kts = 4 nm

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slide10

Procedures for Advancing an LOP

STEP #4:

  • The point where this advanced LOP and the second LOP cross is the running fix position.
  • Mark a circle and properly plot and label the “R-FIX” with the time.
  • Plot a new course and speed line IAW the six rules of DR.
slide11

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Running FIX

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slide12

Estimated Position (EP)From a single LOP

  • Estimated Position - The most probable position of vessel determined from incomplete data or data of questionable accuracy.

Purpose:

  • Used when you can’t obtain a second LOP within the allowed 30 minutes.
slide13

Estimated Position (EP) Plotting Procedure

Draw a construct line originating at the DR position corresponding to the time of the single LOP and terminating at the closest point on the LOP ( a  segment).