Lesson08 Running Fixes

Lesson 8: Running Fixes: 

Lesson 8: Running Fixes

Slide2: 

AGENDA: Procedures for advancing two or more non-simultaneous LOP’s. Procedures for plotting/labeling running fixes. Applicable reading: Hobbs pg. 138-144. Lesson 8: Running Fixes

Learning Objectives: 

Learning Objectives 1. The student will apply correct procedures for advancing two or more non-simultaneous, nonparallel lines of position to establish a running fix. 2. 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. 3. The student will comprehend the reliability of running fixes compared to simultaneous fixes.

Slide4: 

STEP #1: Take a bearing to the Nav Aid and draw on the chart. Mark your DR position from the last fix using ordered course and speed. Procedures for Advancing an LOP

Running Fix: 

Running Fix Why: Used during low visibility when the navigator can only obtain on LOP from one object at a time. Usage: Do we use this a lot? NO. Need to be able to apply it, and understand it.

Slide6: 

Light Running FIX 9 9 9 9 9 9 9 9 9 9 9 5 5 5 5 11 11 11 11 11 11 11 11 6 pa FL 6s 58ft 9M Tank Long Point 20 20 20 20 20 20 21 20 20 20 21 21 21 21 21 21 23 23 23 23 23 23 15 15 15 15 17 17 17 17 19 19 19 19 C- 085 T S - 12 0800 0810 0810

Slide7: 

STEP #2: Take a second bearing and record it, usually waiting at least 20 minutes to allow for bearing separation between LOP’s. Procedures for Advancing an LOP

Slide8: 

Light Running FIX 9 9 9 9 9 9 9 9 9 9 9 5 5 5 5 11 11 11 11 11 11 11 11 6 pa FL 6s 58ft 9M Tank Long Point 20 20 20 20 20 20 21 20 20 20 21 21 21 21 21 21 23 23 23 23 23 23 15 15 15 15 17 17 17 17 19 19 19 19 C- 085 T S - 12 0800 0810 0810 0830 0830

Slide9: 

Procedures for Advancing an LOP STEP #3 Determine distance traveled in time between LOP’s (at ordered course and speed). Measure this distance from the point where the first LOP intersects your track. Mark this point on the DR track.

Slide10: 

Light Running FIX 9 9 9 9 9 9 9 9 9 9 9 5 5 5 5 11 11 11 11 11 11 11 11 6 pa FL 6s 58ft 9M Tank Long Point 20 20 20 20 21 20 20 20 21 21 21 21 21 21 23 23 23 23 23 23 15 15 15 15 17 17 17 17 19 19 19 19 C- 085 T S - 12 0800 0810 0810 0830 20 min @ 12 kts = 4 nm 4 nm 0830

Slide11: 

STEP #4: Parallel the first LOP through this point on the DR. Label this advanced LOP with both the original time and the time it was advanced to. Procedures for Advancing an LOP

Slide12: 

Light Running FIX 9 9 9 9 9 9 9 9 9 9 9 5 5 5 5 11 11 11 11 11 11 11 11 6 pa FL 6s 58ft 9M Tank Long Point 20 20 20 20 21 20 20 20 21 21 21 21 21 21 23 23 23 23 23 23 15 15 15 17 17 17 17 19 19 19 19 C- 085 T S - 12 0800 0810 0810 0830 20 min @ 12 kts = 4 nm 4 nm 0810-0830 0830

Slide13: 

Procedures for Advancing an LOP STEP #5: 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 seven rules of DR.

Slide14: 

Light Running FIX 9 9 9 9 9 9 9 9 9 9 9 5 5 5 5 11 11 11 11 11 11 11 11 6 pa FL 6s 58ft 9M Tank Long Point 20 20 20 20 21 20 20 21 21 21 21 23 23 23 23 23 23 15 15 15 17 17 17 17 19 19 19 19 20 21 C- 085 T S - 12 0800 0810 0810 0830 0830 0810-0830 20 C- 085 T S - 12 R-FIX 0830

Any other rules for running fixes?: 

Any other rules for running fixes? Relies on an accurate DR Cannot work with a LOP advanced more than 30 minutes (too many errors accumulate)

Questions?: 

Questions?