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Blind Pilotage LRG.ppt
- 1. Grunt Productions 2007 BLINDPILOTAGE A Brief By Lance Grindley
- 2. Definition: ‘The navigation ofthe ship through restricted waters in low visibility with little or no recourse to the visual observation of objects outside the ship.’
- 3. Grunt Productions 2007 BLINDPILOTAGE 1. Navigation and Pilotage a) Primary method: Visual b) Secondary method: Radar c) Other methods: ‘NAVAIDS’ 2. Fundamental Navigational Radar a) Stabilised in azimuth b) Bearing accuracy ±1° c) Range accuracy better than 20 yds (depending on pulse length) d) Anti-clutter controls e) Range scales (1007) 0.5, 0.75, 1.5, 3, 6, 12, 24, 48 miles f) Fitted with: Electronic Blind Pilotage System
- 4. Grunt Productions 2007 PLANNING TRACK - Chosen by Master, based on visual plan. SAFE WATER - Delimited by Limiting Danger Line (LDL): Draught+2m-Height of Tide.
- 5. Grunt Productions 2007 BLINDPILOTAGE • Where are we in relation to planned track ? • How much safe water remains ? • How far to run to the next course alteration ?
- 6. Grunt Productions 2007 ParallelIndices 2m
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- 9. Grunt Productions 2007 WO 7.6c 4.0c 5.2c NMT11c NLT 2c NMT 13c NLT 1c
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- 11. Grunt Productions 2007 WO 7.6c 4.0c 5.2c NMT11c NLT 2c NMT 13c NLT 1c 6.2c
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- 15. Grunt Productions 2007 270(270) 1m NLT 4c NLT 5c 1.3m 1.4m
- 16. Grunt Productions 2007 INPOSITION
- 17. Grunt Productions 2007 RadarErrors Index Errors
- 18. Grunt Productions 2007 Ie+/- 50 yds
- 19. Grunt Productions 2007 FINDINGTHE INDEX ERROR TWO MARK METHOD A = True range ± IE B = True range ± IE C = Charted distance Index error = C – (A + B) 2 A B C Index error
- 20. Grunt Productions 2007 ThreeMark Method
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- 22. Grunt Productions 2007 TwoShip Method Compare B to A to find Index Error. IE = B - A = C - 2A A(IE) Range (A) between own ship and other incorporates Index Error. C (IE) Range (C) between own ship and false echo also incorporates Index Error. B(No IE) True Range is therefore C-A which equals B.
- 23. Grunt Productions 2007 RadarErrors Index Errors Strobe Accuracy
- 24. Grunt Productions 2007 Distortioncaused by beam width Direction of Aerial Rotation A2 A1 B C D Coastline E
- 25. Grunt Productions 2007 RadarErrors Index Errors Strobe Accuracy Error introduced by controls
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- 27. Grunt Productions 2007 RadarErrors Index Errors Strobe Accuracy Error introduced by controls Inaccuracies by not using shortest range scale
- 28. Grunt Productions 2007 RadarErrors Index Errors Strobe Accuracy Error introduced by controls Inaccuracies by not using shortest range scale Sloping beach/HOT
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- 31. Grunt Productions 2007 RadarErrors Index Errors Strobe Accuracy Error introduced by controls Inaccuracies by not using shortest range scale Sloping beach/HOT
- 32. Grunt Productions 2007 EXECUTION Ensure chart and PI’s are accurate. Conduct time check. Maintain constant commentary - “30 yds port of track with a further 150 yds of safe water to port. 3 cables to run to the wheel over. Recommend come right to new course 095 to regain”