1 / 20

RADAR PLOTTING 3

RADAR PLOTTING 3. 2008. CANADIAN COAST GUARD AUXILIARY - PACIFIC. End On Situation. Own vessel 050° at 10 knots 6 minute plot. (1) Find the course you are going, and draw a line for your course In the case of heads up , mark 000°. Own vessel 050° at 10 knots 6 minute plot. 12:00 O.

sandra-moore
Download Presentation

RADAR PLOTTING 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RADAR PLOTTING3 2008 CANADIAN COAST GUARD AUXILIARY - PACIFIC

  2. End On Situation

  3. Own vessel 050° at 10 knots 6 minute plot (1) Find the course you are going, and draw a line for your course In the case of heads up , mark 000°

  4. Own vessel 050° at 10 knots 6 minute plot 12:00 O (2) Mark the first radar bearing and range of the target. 358º R x 2.5 nautical miles. All bearings are R as they are relative to your vessel’s head. Mark as "O“ Mark time of 1200

  5. Own vessel 050° at 10 knots 6 minute plot 12:00 O (3) After 6 minutes mark the second radar bearing and range of the target. 359ºR x 0.77 nautical miles Mark as “A” Mark time of 1206 12:06 A

  6. Own vessel 050° at 10 knots 6 minute plot 12:00 O (4) From "O" draw a line through "A" and carry the line well past the centre line on the screen 12:06 A

  7. Own vessel 050° at 10 knots 6 minute plot 12:00 O (5) Transfer your course line to "O" and pull the line down the sheet 12:06 A

  8. Own vessel 050° at 10 knots 6 minute plot 12:00 O (6a) Calculate own vessel distance in plot interval. To use calculator scale, place right point of divider on 60 (right end of scale) and left point on own vessel speed (10 knots). 12:06 A

  9. Own vessel 050° at 10 knots 6 minute plot 12:00 O (6b) Move the dividers at this setting, and place right point on the plot interval (6 minutes) The number under the left point of the dividers will indicate the distance gone in the plot interval. (1 nautical mile). 6 min @ 10 knots = 1.0nm. 12:06 A

  10. Own vessel 050° at 10 knots 6 minute plot 12:00 O W (6c) Lay down 1 nautical mile on the plot, on own course vector from “O”. Mark bottom end “W” 12:06 A

  11. Own vessel 050° at 10 knots 6 minute plot 12:00 O W (7a) Connect “W” with “A”. “W” to “A” represents target course and distance travelled in the plot interval. 174°R @0.75 nautical miles To convert this into speed, place right point of dividers on plot interval (6 minutes) and the left point on distance travelled in that time (0.75 nm) 12:06 A

  12. Own vessel 050° at 10 knots 6 minute plot 12:00 O W (7b) Move dividers so that right point is on 60 (right hand end of scale). The reading under the left point of the dividers will be the vessel’s speed in knots. 7.5 knots 12:06 A

  13. Own vessel 050° at 10 knots 6 minute plot 12:00 O (8) Where the line through “O” and “A” passes closest to the centre of the plot is the Closest Point of Approach (CPA) In this case very close to starboard - scraping the tube. W 12:06 A

  14. Own vessel 050° at 10 knots 6 minute plot 12:00 O (9) The Time to Closest Point of Approach (TCPA) is at the tangent point. OA is 6 minutes. A to TCPA works out at 2.5 minutes = 12:08:30 W 12:06 A TCPA

  15. Results In this case, providing neither you nor the target vessel alter course or speed: • the target vessel is proceeding at 050° + 174° = 224°C at 7.5 knots • CPA is at 12:08:30 with a collision

  16. Results – Clear Visibility • In clear visibility, you are to assume you in an end on situation and therefore must take action to avoid collision. Whilst the other could be taken as a crossing vessel, it is safer to assume an end on situation. • There is a risk of collision, and therefore you must make a bold alteration to starboard. • The other vessel should do likewise.

  17. Results – Restricted Visibility • In restricted visibility, you are required to take action. • As in clear weather, a broad alteration of course to starboard is the best action, carefully monitoring the actions of the other vessel. • A 90 degree starboard alteration would be best in this case.

  18. End On Situation

  19. End On Situation • If however at 1206 you acknowledge the other vessel is on a steady bearing, you can stop and assess the situation. • The plot will then change to:

  20. Own vessel 050° at 10 knots 6 minute plot 12:00 O In this case stopping will only gain you thinking time, but does not prevent a close quarters situation. You will need to make a 90° alteration of course to starboard and increase speed to comply with rule 14. You can see immediately he is doing 224°C at 7.5 knots 12:06 A

More Related