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Seamanship

Seamanship. Chapter 6 Anchoring, Mooring and Rafting. Learning Objectives. This session is intended to acquaint you with: anchor types and equipment anchoring techniques locations for effective anchoring mooring and rafting. Anchoring. The skill of securing the vessel to the bottom.

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Seamanship

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  1. Seamanship Chapter 6 Anchoring, Mooring and Rafting

  2. Learning Objectives • This session is intended to acquaint you with: • anchor types and equipment • anchoring techniques • locations for effective anchoring • mooring and rafting

  3. Anchoring • The skill of securing the vessel to the bottom

  4. Anchors

  5. Bottom Conditions

  6. Many boaters carry several anchors of different sizes and types What do you need?

  7. Fluke Type Anchors

  8. Claw Type Anchors

  9. Plow Type Anchors

  10. Mushroom Anchors • Mooring Dinghy anchor

  11. Grapnel closed open

  12. Anchor Storage

  13. Anchor Rode • Rode is the entire length of anchor line or chain between the boat and the anchor

  14. Nylon (et al) Less costly Lighter in weight 20% or greater stretch Shock absorber Easier to work with Heat stress failure Wear and abrasion Some UV damage Chain Expensive Heavy and heavier Rugged Resists wear and abrasion Deep catenary Holds bottom Does not stretch Non-absorbing May need a hoist May bow down trim the boat Corrosion potential Gloves Nylon vs. Chain

  15. Anchor Chain • Strength and weight differences

  16. Correct Anchor Size & Weight • Check your manufacture’s recommendations • Under what conditions will the anchor be used? • Storm anchors – increase the weight and size of rode.

  17. How much Chain and Line? • Typical anchor system • Chain at anchor • Line to boat

  18. Scope – Line/Chain

  19. Scope >>

  20. Scope • Line/Chain combo • 7:1 nominal • 10:1 storm • 5:1 light conditions • All Chain • 3:1 – 5:1

  21. Why Chain? • Prevents chafe on bottom • Hold anchor stock horizontal • Enhances catenary • How long? • 1/2 to full length of boat for combo • More is better

  22. Catenary - Line • Natural catenary – provides cushion • Straightens under wind and wave conditions

  23. Catenary - Chain • Chain contours bottom • Peels from bottom under wind and wave conditions

  24. Anchor Sentinel • Sentinel – weight deployed on anchor rode • Alters catenary to flatter position • Sentinel suspended and held in place by line: “Preventer” (red)

  25. Snubber • Snubber – section of line allowing chain to loop • Serves as a “shock absorber”

  26. Anchor Windlass Lock Switch

  27. Shackle, Swivels, Thimble & Hook

  28. Chafing Gear

  29. Identifying Anchorages

  30. No Anchor Warnings No Anchor Areas

  31. Single Anchor

  32. Lowering the Anchor

  33. Anchoring >>

  34. Confirming Hold

  35. Weighing & Retrieving Anchor

  36. Retrieving the Anchor >>

  37. In tight quarters two anchors may be required to control swing Two Anchors

  38. Scope 7 to 10:1 30° to 45° Two Bow Anchors

  39. In confined space two bow anchors can be used Bahamian Mooring Plan for your swing room

  40. Same basic consideration for any anchoring situation Overnight Anchoring

  41. Fouled Anchor

  42. Trip Line

  43. Mooring Approach

  44. Leaving a Mooring

  45. Raftup • Socialization on the water • Boaters can safely move from boat to boat • Planning and permission required

  46. Fenders

  47. Side by Side Rafting

  48. Stern to Stern Rafting

  49. Rafting in a Circle Good manners and courtesy are important during raftups.

  50. End Anchoring, Mooring and Rafting

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