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An alternative means or procedure for controlling a vessel’s direction after failure of the normal steering system. Arrangements may include local control at the steering gear, an emergency tiller, independent hydraulic power or improvised methods appropriate to the vessel. They must be understood, maintained, tested and practised before an emergency occurs.
A removable or dedicated tiller used to turn the rudder when the normal steering linkage or system fails. It usually fits directly to the rudder stock or an emergency steering head. Access, usable leverage and safe crew position should be checked in advance because loads can be high and cockpit structures or steering components may…
To alter course away from the wind. Falling off is also called bearing away. Sail trim must normally be eased as the apparent wind moves aft, while an unintended fall-off may indicate imbalance, a wind shift, waves or insufficient steering control.
A line led forward from a boom or spinnaker pole to restrain upward or aft movement. On a spinnaker pole it works with the topping lift and afterguy or brace to control pole height and position. Leads, fittings and release arrangements must suit the loads and permit safe handling during manoeuvres.
A sailing rig in which the forestay attaches below the masthead. The arrangement can improve control of mast bend and mainsail shape and may use swept spreaders or running backstays for support. The fractional designation describes the approximate height of the forestay attachment relative to the mast.
A navigation light showing an unbroken arc of 360 degrees around the horizon. Its colour and combination with other lights identify particular vessel conditions under the collision regulations, such as anchoring or restricted manoeuvrability. The light must meet prescribed visibility, positioning and screening requirements.
The process of embedding an anchor and confirming that it is developing reliable holding power. After the anchor reaches the seabed, cable is paid out while the vessel moves away and load is increased progressively. Bearings, position, cable behaviour and engine load can help confirm the anchor has dug in rather than merely dragging across…
The operation of securing a vessel to the seabed with an anchor and cable. A safe anchorage requires suitable depth, holding ground, shelter, swinging room and clearance from hazards and other vessels. The anchor must be laid and set with appropriate scope, then monitored for dragging and changing conditions.
The horizontal angular sector through which a navigation light is required to be visible. Different lights have prescribed arcs: sidelights, masthead lights, sternlights and all-round lights cover different sectors. Correct positioning and screening prevent misleading overlap and preserve the vessel aspect indicated to observers.
The component of sea-level change predicted from the gravitational effects and motions of the Moon, Sun and Earth. Harmonic predictions describe this regular component for a location. Actual water levels may differ because of atmospheric pressure, wind, waves, river flow and other meteorological or oceanographic effects.
If you belive the Earth is flat, you're about to fall of the end...
If you belive the Earth is flat, you're about to fall of the end...
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