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tracking ns 302

Lesson Overview. TrackingClosest Point of ApproachContact Course and SpeedAvoiding CourseRules of the Road ReviewCaptain's Contact Report. Why Track?. Tracking allows us to determine whether that ship or object represents a navigational threat to our ship.Tracking gives us contact's:CPA; andcourse and speed.

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tracking ns 302

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    1. TrackingNS 302

    3. Why Track? Tracking allows us to determine whether that ship or object represents a navigational threat to our ship. Tracking gives us contact’s: CPA; and course and speed

    4. Closest Point of Approach (CPA) The point in which the contact will be the closest to own ship. Shortest distance between the DRM and center of maneuvering board. Three elements bearing range time

    5. Finding CPA 1. Find the direction of the relative motion.

    6. Finding CPA (bearing) 2. To the DRM, add or subtract 90°. This gives you the CPA bearing.

    7. Finding CPA (range) 3. Draw a line from the center along the CPA bearing. The length of the line from the center to where it intersects the DRM is the CPA range.

    8. Finding CPA (time) 4. Find the distance between M1 and M2. (MRM) Distance of Relative Motion

    9. Finding CPA (time) 5. Find the time it took for the contact to from M1 to M2.

    10. Finding CPA (time) 6. Use the known values (MRM and time) to solve for the speed of relative motion (SRM) on the nomogram.

    11. Finding CPA (time) 7. Plot M3 at the point of CPA. Measure the distance between M2 and M3.

    12. Finding CPA (time) 8. Use nomogram to now solve for time to travel the 2400 yds given the SRM (12kts)

    13. Finding CPA (time) 9. Add the time computed to the time at M2.

    14. Finding CPA CPA for this contact: 090°, 1000 yds at time 0809

    15. Finding Contact’sCourse and Speed 1. Draw own ship’s er vector.

    16. Finding Contact’sCourse and Speed 2. Parallel the DRM to the er vector. This will be your rm vector.

    17. Finding Contact’sCourse and Speed 3. Mark off the SRM on the rm vector.

    18. Finding Contact’sCourse and Speed 4. Draw a vector from the center to the mark on the rm vector. This is your em vector.

    19. Avoiding Course Course and speed that own ship has to steer to avoid hitting the contact or to open the CPA to the contact.

    20. Avoiding Course 1. Draw a new DRM from M2 to a tangent along the 2,000yd range ring.

    21. Avoiding Course 2. Parallel new DRM to end of em vector.

    22. Avoiding Course This new rm vector represent all the possible courses and speeds to cause the contact to track down the new DRM line.

    23. Avoiding Course 3. Draw the new er1 vector from the center to where the rm vector intersects the 15kt speed ring.

    24. Avoiding Course 4. Compute the revised CPA.

    25. Rules of the Road Review Used to prevent collisions at sea. 38 Rules - International and Inland Rule 13 - Overtaking Situation Rule 14 - Meeting (Head-on) Situation Rule 15 - Crossing Situation

    26. Rules of the Road Review Stand-on Vessel the vessel which has the right of way maintains course and speed Give-way Vessel the vessel which does not have the right of way must stay clear and may not impede the stand-on vessel

    27. Rule 13Overtaking Situation “when coming up with another vessel from a direction more than 22.5 degrees abaft her beam”

    28. Rule 13Overtaking Situation

    29. Rule 14Meeting (Head-on) Situation Two vessels on reciprocal courses or nearly reciprocal courses “when a vessel sees the other ahead or nearly ahead”

    30. Rule 14Meeting (Head-on) Situation

    31. Rule 15Crossing Situation All other situations - not overtaking or meeting “vessel which has the other on her own starboard side shall keep out of the way, and shall … avoid crossing ahead of the other vessel”

    32. Rule 15Crossing Situation

    33. Rule 15Crossing Situation

    34. Captain’s Contact Report Given to the captain for contacts in accordance with his standing orders contacts with CPA <5,000 yds (day) or <10,000 yds (night) high speed contacts - true speed >20kts

    35. Contact Report Good morning, afternoon, evening Captain I have a contact 10/20/30/40/50/60 degrees to port/stbd at ____ yds with a ____ target angle. Contact has left/right/no bearing drift and is on course ____ at ____ kts. CPA will be on the port/stbd bow/quarter/beam at ____ yds in ____ minutes.

    36. Report Format I can see range/masthead/port/stbd running/stern light(s). The contact is identified as (name of ship) / merchant. This is a crossing/overtaking/meeting situation. I intend on maintaining course and speed / coming right/left ___ degrees to open CPA to ___ yds on the port/stbd bow/quarter/beam in ___ minutes.

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