Marine Navigation Cruise

Akron Power Squadron - Marine Navigation Class

Part  2 - Starts on p 98 (Appendix A)
Location of key ATONS for Part 2

Tower R Lt on the hill to the north, 41° 45.6' N, 071° 55.2' W
Chapman Point light Fl 6s 18M HORN. 41° 41.4' N, 072° 05.5' W
R “10” Q R 41° 39.6' N, 071° 57.6' W

R N “2” the entrance to Blackfish Creek 41° 35.3' N, 071° 55.2' W
R N “4”. 41° 33.6' N, 071° 55.1' W
G C “3” at the entrance to Blackfish Creek 41° 33.9' N, 071° 54.4' W

Fl 8s 20 ft 5M beacon on Channel Island 41° 41.7' N, 071° 53.8' W

R “8” I Q R 41° 40.2' N, 071° 51.9' W

The cruise is found in Appendix A, p 97 of the Student Manual.

The cruise is taken on Bowditch Bay.  For all questions, use a variation of 15 W


4. Take bearings to establish your 1000 position.


The bearing to the Chapman Point light Fl 6s 18M HORN is 285°M
and the bearing to the Tower R Lt north of Channel Island is the same as your previous reading – 027° M

What is the L & Lo of 1000 FIX?

Tower                Chapman
T = 012°            T = 270°
V = 015° W       V = 015° W
M = 027°           M = 285°

Plot and label each bearing. The intersection of these two bearings is a fix. Plot and label the 1000 fix.

What is the L & Lo of 1000 FIX?

4. L 41° 41.4’ N, Lo 071° 56.4' W


5. Plot and label a course from the 1000 FIX to R “10” Q R. You proceed at a speed of 20 kn.


Measure distance to R “10” Q R

D = 2.0
Then, determine time to travel 2.0 nm

D = 2.0
  60 D = ST
  60 * 2.0 / 20.0 = T
  6.0 = T



ETA:

    1000
  + 0006
     1006

5a. ETA at R “10”Q R = 1006


5b. Measure course from 1000FIX to R “10” Q R, then convert to magnetic  

T = 208°  
V = 015° W  
M = 223°  


5b. What is your course from 1000FIX to R “10” Q R?     223° M



6. You arrive at R “10”Q R at your estimated time (1006)., Plot a course from R “10”Q R to R N “2” at the entrance to Blackfish Creek. Reduce speed to 4.5 kn.

Plot and label the fix at 1006.

Plot and label the course to R N “2”

T = 158°  
V = 015° W  
M = 173°  

6a. What is the course? 173° M

Plot the 1100 DR position

Determine time to 1100

  11 hr 00 min
-10 hr 06 min

           54 min

60 D = ST

D = 4.5 * 54
          60

D = 4.05 = 4.1 (round up)

Plot 1100 DR on course line
Determine L/Lo


  6b. 1100 DR position is: L 41° 35.8’ N Lo 071° 55.5’ W 

7. Arrive at R N “2” at 1112. Plot a course to R N “4”. You increase your speed and arrive at 1120.

Plot and label the 1112 fix

Plot and measure the course to R N “4”. Label the leg.

T = 176°  
V = 015° W  
M = 191°  

7a. Why didn’t you plot your course directly to R N “2” from your 1000 position?

Stay well off the Submerged rocks SW Channel Island

7b. Determine your average speed from R N “2” to R N “4”

Determine the time you traveled on this leg. Measure the distance of this leg.
Calculate your average speed

  11 hr 20 min
-11 hr 12 min

            8 min

  D = 1.7
  60 D = ST
  60 * 1.7 = S * 8
  60 * 1.7 / 8 = S 

  S = 12.75 = 12.8 (round up)

7b. average speed 12.8 kts



8. You depart from G C “3” at at 1300 and lay a course of 023° M at a speed of 20 kn.  

Plot the fix at G C “3”. Label this course.

T = 008°  
V = 015° W  
M = 023°  



At 1316 take a bearing on the Fl 8s 20ft 5M beacon on Channel Island of 011°M. Take another bearing on the R “8”I Q R buoy. of 068°M. Plot the two bearing FIX.

First, calculate and plot your DR position.

Time:
13 hr 16 min
- 13 hr 00 min
  16 min

DR Position

60 D = ST
 D = 20 * 16
  60
D = 5.33 = 5.3 (round down)

Calculate and plot the bearings

Channel Isl R “8”I Q R 
T = 356° T = 053°
V = 015° W V = 015° W
M = 011° M M = 068°

Use the dividers to measure the L/Lo of 1316 Fix:

8a. 1316 DR position L 41 39.2’ N Lo 071 53.4’ W


End of Part 2