Enav222 midterm lessons
METHOD I (PROCEDURES)
ALTER COURSE AND MAINTAIN SPEED
SITUATION:
Our ship is on Course 0000 T speed  11 knots. Our radar is set on 12 mile scale. A contact is observed as follo...
Find:
RCPA          TC
TCPA           TS
MCPA         Target Aspect
MRM
DRM
SRM
PART 1- PLOTTING THE 1ST VECTOR (e-r-m)
Oc=0000
OS=11knots
X
M1/0603
M2/0609
M3/0615
RML
R
Spd=11kts.
Tdiff.= 12 min
Dist= 2.2miles
2.2
Find:
RCPA          TC
TCPA           TS
MCPA         Target Aspect
MRM
DRM
SRM
END of PART 1- PLOTTING THE 1ST VECTOR (e-...
PART 2-Plotting the 2nd Vector (e-r1-m)
MX
BMX
TMX
RMX
NDRM
NSRM
NTCPA
NBCPA
NRCPA
Find and Plot the ff:
r
m
6miles
NRML
3miles
e
MX
NDRM
2.2
WHAT WILL BE OWN SHIP’S NEW COURSE?
r
NRM & RL
m
NRML
r1
e
MX
NDRM
2.2
NCo
r
NRM & RL
m
NRML
r1
e
MX
NDRM
Nco=054o
r
NRM & RL
m
NRML
r1
e
MX
NDRM
RML
R
DRM
MX
BMX
TMX
RMX
NDRM
NSRM
NTCPA
NBCPA
NRCPA
Find and Plot the ff:
Of change course problems
END
METHOD II (PROCEDURES)
MAINTAIN COURSE AND ALTER SPEED
Own ship’s course could be changed to either 054o or 294o . However, there is a reef to starboard and three ships to port ...
r
NRM & RL
m
r1
NRML
e
MX
Spd.reduce to 5.2kts.
NDRM
RML
R
DRM
METHOD III (PROCEDURES)
ALTER COURSE AND ALTER SPEED
Instead of continuing own ship at the speed of 11 knots and instead of changing course to either 054o or 294o we decide to...
r
MX
m
e
Tdiff.= 12 min
Dist= 3.0miles
Spd=15kts.
NRM & RL
r1
e
3miles
NCO=065O
r
m
NRM & RL
MX
r1
NRML
e
NDRM
HOW TO PLOT NEW COURSE
NCO=065O
r
m
NRM & RL
MX
r1
NRML
e
NDRM
END
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Second vector

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COLLISION AVOIDANCE MANEUVER (Method I)

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Second vector

  1. 1. Enav222 midterm lessons
  2. 2. METHOD I (PROCEDURES) ALTER COURSE AND MAINTAIN SPEED
  3. 3. SITUATION: Our ship is on Course 0000 T speed 11 knots. Our radar is set on 12 mile scale. A contact is observed as follows: TIME BEARING RANGE 0603 0600 11 miles 0609 0590 9.5 miles 0615 0580 8.0 miles CHANGE OF COURSE
  4. 4. Find: RCPA TC TCPA TS MCPA Target Aspect MRM DRM SRM PART 1- PLOTTING THE 1ST VECTOR (e-r-m)
  5. 5. Oc=0000 OS=11knots X M1/0603 M2/0609 M3/0615 RML R Spd=11kts. Tdiff.= 12 min Dist= 2.2miles
  6. 6. 2.2
  7. 7. Find: RCPA TC TCPA TS MCPA Target Aspect MRM DRM SRM END of PART 1- PLOTTING THE 1ST VECTOR (e-r-m)
  8. 8. PART 2-Plotting the 2nd Vector (e-r1-m)
  9. 9. MX BMX TMX RMX NDRM NSRM NTCPA NBCPA NRCPA Find and Plot the ff:
  10. 10. r m 6miles NRML 3miles e MX NDRM 2.2 WHAT WILL BE OWN SHIP’S NEW COURSE?
  11. 11. r NRM & RL m NRML r1 e MX NDRM 2.2
  12. 12. NCo r NRM & RL m NRML r1 e MX NDRM
  13. 13. Nco=054o r NRM & RL m NRML r1 e MX NDRM RML R DRM
  14. 14. MX BMX TMX RMX NDRM NSRM NTCPA NBCPA NRCPA Find and Plot the ff:
  15. 15. Of change course problems END
  16. 16. METHOD II (PROCEDURES) MAINTAIN COURSE AND ALTER SPEED
  17. 17. Own ship’s course could be changed to either 054o or 294o . However, there is a reef to starboard and three ships to port that prevent either course changes. Required: What other course of action could be taken? Answer: Reduce speed = 5.2knots CHANGE SPEED PROBLEMS
  18. 18. r NRM & RL m r1 NRML e MX Spd.reduce to 5.2kts. NDRM RML R DRM
  19. 19. METHOD III (PROCEDURES) ALTER COURSE AND ALTER SPEED
  20. 20. Instead of continuing own ship at the speed of 11 knots and instead of changing course to either 054o or 294o we decide to increase speed to 15 knots. Required: What course change will have to be made so that at 15 knots, the CPA will continue to be 3 miles? Answer: 065oT CHANGE OF SPEED AND COURSE PROBLEM
  21. 21. r MX m e Tdiff.= 12 min Dist= 3.0miles Spd=15kts.
  22. 22. NRM & RL r1 e 3miles
  23. 23. NCO=065O r m NRM & RL MX r1 NRML e NDRM
  24. 24. HOW TO PLOT NEW COURSE
  25. 25. NCO=065O r m NRM & RL MX r1 NRML e NDRM
  26. 26. END

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