Anchoring Flashcards
What are the 9 things to think about when choosing an anchorage
Check the chart to make sure you are not in an anchor restricted area
Check that you are not infringing local port authority rules
Check the weather to make sure the vessel is not going to be on a lee shore on a strong wind
Check the chart to see if the area is free from obstructions, rocks or anything else that could cause the anchor to become snagged
Check the chart to make sure that the seabed is suitable for anchoring eg sand, kelp, rocks, mud, pebbles, ect
Check the area has reasonable shelter
check the tide and current to make sure the boat can swing
Check that you are out the way of other boating traffic
Check that you have enough room to clear obstructions or other vessels if the vessel swings in the tide or wind
What are the 4 ways to check the anchor is secure?
you can reverse the boat, and if the chain trembles the anchor is dragging, whereas if the bow dips the anchor is digging in
You can Watch a transit off the beam of the boat, and if it goes out of line then the vessel is dragging
The depth sounder can be used to watch for changes in depth, allowing for the rise and fall of the tide
The Gps can be used to make sure the boat is only moving in an arc around the anchor
Why is height of tide important to consider when anchoring
to make sure that the boat won’t dry out, and to make sure you pay out enough anchor warp to have an appropriate scope at high tide
What depth of water should the skipper layout anchor warp for
4-8 times the maximum depth of water a hight tide, otherwise at high tide the anchor will be less secure
What is the maximum amount of water the skipper can anchor in
Max depth = length of anchor chain/ 4 - 8 (depending on weather). This is depth at high tide
what is the minimum depth that the skipper can anchor in
Min Depth = Draught + Clearence
What must be displayed when anchoring during the day
An anchor ball
what must be Displayed when anchoring at night
an all-around white anchor light
What is anchor warp
A nylon Line used as part of the Anchor chain, as its cheaper
When using anchor chain, how much should be let out
4-8 times the depth of water at high tide depending on weather conditions expected
When using anchor warp how much should be let out
6-10 times the depth of water at high tide depending on weather conditions expected
What are the steps for anchoring in a strong 2-way tidal flow
First, set your main anchor, and pay out all your chain/warp. Then set your second anchor, such as a kedge or spare anchor at the downstream side of the boat, then motor forwards taking in chain on the first anchor and letting it out on the second until the two anchor warps/chains have the same length.
When anchoring in a strong 2 way tidal flow, whats important to consider
the boat has room to swing on either anchor and that both have enough chain and warp to hold the boat individually.
When anchoring in a strong 1 way tidal flow what should you do
place 2 anchors in a y shape at a 30 degree angle apart, both with enough chain or chain and warp to hold the boat on its own.
why does the chain lying on the sea bed help the anchor hold?
its weight keeps the stock of the anchor lying flat on the seabed, causing the fluke of the anchor to dig in.
What is another advantage of having more chain or chain and warp paid out when anchoring
its weight can act as a shock absorber, stopping the anchor jerking the boat if its hit with a large gust or wave
What are the 4 parts of the anchor
The stock, which is the horizontal bar at the top of the anchor to stop it from rolling
The crown, which is where the shank and the flukes meet. this is often where a tripping line is attached
the fluke is the blade that digs into the sea bed and is the main variation between different anchor types
The shank is the shaft of the anchor to which the chain or chain and warp attaches to
What is the purpose of a tripping line
A tripping line is used to get an anchor to stop binding to the seafloor if it is stuck, it does this by pulling from the opposite side the boat does, helping it to be easily removed from the seabed.
What are the advantages of a Danforth anchor
the danforth folds flat so it stows well, and is good at holding in mud and sand
what are the disadvantage of a Danforth anchor
its moving parts can trap fingers, poor holding in gravel or rock
Whate are the advantages of a delta anchor
the delta anchor is good at holding in practically all circumstances and can be stored and launched off a bow roller
What are the disadvantages of a delta anchor
it can get stuck, so a tripping line is essential
What are the advantages of a grapnel anchor
good for small boats and dingys, good for rocky areas, folds down and stores away compactly
what are the disadvantages of a grapnel anchor
it has very average holding
