small yacht practical advice - Fitting Out and Laying up - good working knowledge-article
engine technique - "do it yourself" technique - auto engine converted to marine use
Boat shopping simple guide - important considerations
Point of View - Is Bigger Boat Better?
Fisherman type - Fisherman anchors, characteristics & advice for selection
the Old style pole mooring - spar/devil's claw arrangement
Detection and methods - How to Curing leaking keel bolts
When your anchor is dragging - Drag Queen Anchor Alarm
As you can see the title "Anchor Alarm" says it all. Along with an alarm delay Drag Anchor Alarm provides distance and GPS accuracy parameters. Use this boat app to be notified.
The anchoring scenario is clear: you put into some strange harbor, dog tired after a long day on the water, and set the hook. To ensure the anchor is set properly Boaters do everything, but how can they be sure?
The Drag Oueen Anchor Alarm could be the answer. A GPS-based app, it constantly monitors your boat posi-
tion, and if the boat moves outside of a user set area, a loud alarm sounds to warn you, quite annoying in fact that your anchor is dragging.
The only downside of the Drag Queen Anchor Alarm is the app doesn't work in the background. The boating device has to be awake, which means your batteries take a hit, so you really have to have it plugged into the boat's power supply overnight. (iPad, Android and iPhone) Its Free; itunes, more at Google Play
Anchoring Problems & Rules
Boat Articles, Guides, Commentary and archival articles & helpful sailing - information
Problems and General Rules
Problems with Snatching in shallow water
and steep waves, any boat can snatch badly at her anchor rode.
In such circumstances, it's easier on the gear to use a nylon rode to absorb the snatching loads. Even with an all-chain anchor rode, a 20 foot spring of three-strand nylon made fast with a rolling hitch to the chain mounted near the bow is probably more effective than is a traveler weight in preventing destructive snubbing.
Problems with Scope
In Fact:The more horizontal the rode on the sea bottom where it attaches to the anchor, the better. This effect of It often happens that crowded anchorages limit your swinging room and, therefore, your scope. But if you are forced to lie to a shortened rode, here is how it will affect your holding power. Presuming that a scope of 10 to 1 offers 100% anchor's holding power, then, approximately: 7 to 1 - 90 % HP, 6 to 1 - 85% to 2 to 1 - 25/35 % HP
In Fact Proper scope under good weather conditions, the minimum scope of an anchor rode should be 5:1 ratio.
Scope is measured as the ratio between the depth of the water and the length of the anchor rode/chain veered out. The depth of the water in this calculation also includes the extra length between the bow chock and water level. These amounts of scope allow a nylon rode with at least 8 feet of chain attached to the anchor to exert a low-angle of pull against the anchor. Note: Most anchors tend to break out if the angle of pull is more than 7-10 degrees from the horizontal line.
Problems with Corals
When boat anchored in sea areas where coral heads are prevalent, a chain rode frequently wraps around one or more heads(colony of polyps), dangerously shortening the scope.
The general rule is to buoy(usually, 2-3 buoys are needed) the chain so that the main part of the rode cannot foul coral. Some experienced cruisers prefer to anchor in depths of between 90 to 120 feet when possible, because colony of coral polyps live in much deeper water. But this requires more anchor line than many small boats can comfortably carry.
Anchor Chain Problems
High-tensile anchor's chains - Although it has a huge breaking load, it can fail without warning and not recommended for anchor rodes.
In fact: galvanized st-steel anchor chain with short oval links is usually specified for pleasure-boats and yachts use because it gives visible signs and defects of stretching before breaking. Recommendations: the chain must have a breaking strength to withstand at least five times the normal horizontal load.
The difference in having your anchor set properly
Buy an anchor chain. They usually come with a screw pin shackle and alot of times are PVC coated. This will do two things.
1. it will weigh your anchor shank down so if there is any wind or seas your anchor will stay set and you won't move.
2. It will keep your line from chaffing on anything on the bottom like rocks, coral, etc.
Having several feet of chain between your anchor and the rope makes all the difference in having your anchor set properly. There are several online resources to determine how much your boat will need.
In my case, for my 240 Overnighter, 15' was needed to keep the wind and currents of the Gulf near Tampa Bay from pulling my anchor out. Previously, I only had 5'.
See on photo above how the chain in this picture has a screw pin shackle on each end with a swivel. It may seem like alot at $6 a foot but realistically you should only need about 5 or 6 feet of chain unless you are anchoring in really deep water. This will make your anchor line last alot longer
Anchor the stern
Never anchor the stern UNLESS you anchored your Bow correctly first. When you anchor the stern the wind and/or current will turn your boat so that any waves come straight at your stern while your anchor digs in and pulls your boat lower and allowing even more water to spill in to your boat.
Problem when you anchor
How to determine how much line you have let out through the windlass
Just measure it out and spray paint it. If you have 20 ft of chain. Then the first mark is at 30 ft on the rode every 50 ft thereafter. Over the winter we are going to mark it in 25 ft increments. One red paint line at 25, two at 50, three at 75 and different color at a hundred. Then start again.
There are also marked pull through nylon flags/tags (approx 1/2 to 3/4 " wide and 5" long) that pull through braid with increments of 10' from 200' down to 100' and every 5' below.
You can mark chain every spring with iridescent day glow paint with mark on links starting at 40' (min 3-1 in 10' with deck to water figured in) and increasing by one mark every 10' of 100'.