Lesson 9: Running Fixes

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# Lesson 9: Running Fixes - PowerPoint PPT Presentation

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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Lesson 8: Running Fixes

• AGENDA:
• Definition of Running Fix
• Plotting/labeling running fixes.
• Determining an EP.
• Applicable reading: Hobbs pg. 138-147.
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.

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.

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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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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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.

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20 min @ 12 kts = 4 nm

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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.

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R-FIX 0830

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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.

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).