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Setting Anchor Factors influencing anchor setting Scope in ground tackle.
Thanks
to
 Sailnet
and good Old Boat for the image and linkAll anchors are designed to dig in when pulled horizontally. If pulled vertically they break free, otherwise we would not get them back. Scope is the ratio of depth to line paid out. Short scope (3:1) limits your swing in a crowded anchor, but is harder to get a good hold on the bottom. Longer scope increases the holding power of the anchor, but you will need more space and the likely hood of sailing around the anchor increases. The above image is 5:1 scope 100 ft in 20 ft water depth. Problems with long scope Long scope helps getting an anchor to dig in as the anchor line is more likely to pull horizontally. The problem with lying to a long scope is that you need lots of space which you might not get in a crowded anchorage. Secondly you will find out about anchor sailing. This basically means that the wind will blow you side ways and when the anchor line goes taught you are pulled back. The momentum built up sends the boat to the other side. So you are essentiality sailing around the anchor which gets uncomfortable and the anchor line goes taught slack and taught again. So how do you prevent this. One way is the put up an anchor sail, another is to hand a large bucket ( check this link) from the bow. This acts to dampen the swing as the bow has to tug on the bucket dragging it through the water. Bahamian anchor method is another method we will be looking at in part 3. This involves setting two anchors.
Problems of short scope. The problem with short scope is that the anchor shaft is not lying close enough to the seabed. Short scopes by nature means the anchor does not dig in with enough bite. the Fortress anchor has two settings for the fluke blades which allows you to set for different sea beds and scope.
How do you measure scope length
Imtra have these markers you can press between the links at measured points like very 10ft or 3 meters. A different color for 20ft and 30ft will let you know how much scope you have let out. Mark the line with magic marker or slip some leather strips in between the strands.
Chain rode counter
Auto Anchor
Remote chain counter telling you how much chain or line you have let out. The counter will work for either chain and rope/chain Rhodes. AA150 is Freeman K. Pittman award winner 2006.
This counting device can replace your anchor roller or
be placed behind it. Designed for boats in the 25-45 ft range and rope dia
8-20mm and chain 6-10mm. £250 ex vat. The LED display on top of the unit
counts the anchor rope or chain from the last reading or from zero if reset.
The LED is solar powered so does not need wiring.
Anchor kellets, angels sentinels These are weights that are added to the anchor line or chain with a large shackle or loop which allows the weight to slide along the chain. The weight is lowered down the chain (see below). The effect is to lower the angle of the chain at the anchor bringing it closer to horizontal.
The
anchor buddy is
a kellet (also known as chums,
angels, sentinels, anchor angels) which have been used for generations to anchor
boats more securely. They also reduce the swing radius up to 50%.
"to
have and to hold" sponsored by "Good Old Boat" The
basic rules of anchoring -- and staying put. by Don Launer. A technical look at Ground Tackle
sailonline
the charter company's instruction on anchoring Sailing issues, a free and personal website providing unique information on marine navigation and sailing holidays in Greece and Turkey. lessons on anchoring
When dropping anchor make sure the coast is clear
 Captains
anchoring Quick GuideWhat you need to know about anchoring--fast and easy! Anchoring is a necessary skill for any boater--power or sail--whether you are planning a picnic lunch in a secluded cove or an overnight visit in a distant anchorage. This 16-panel, foldout guide provides you with fast, easy-to-follow instructions for safe and efficient anchoring. Anchoring is in full color and is printed on hinged, heavily laminated, waterproof pages, so this tough resource will hold its own even when you are in rough weather. by Peter Nielsen
The Complete Book of Anchoring and Mooring
Chapter One: Introduction
A modern, authoritative anchoring guide for sailors and powerboaters A boat swinging safely at anchor can be a relaxing conclusion to a great day of boating or an essential emergency measure, while failure to anchor properly can be frustrating, inconvenient, or downright dangerous. The Complete Anchoring Handbook is your path to mastering this indispensable seamanship skill. Based on original engineering analysis--and with contributions from such international anchoring experts as Alain Fraysse and Chuck Hawley--The Complete Anchoring Handbook emphasizes the proven best gear and methods for anchoring safely in any situation with any boat, sail or power. Here's everything you need to know, from the basics to the most advanced techniques
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The
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