Sail into the waves meaning free#
Two such lights are displayed by a ship over 150 feet (46 m) in length.Īpparent wind :The perceived wind direction experienced on a moving boat.Īstern – in the direction of, or behind, the sternĪs the crow flies: A direct line between two points (which might cross land) which is the way crows travel rather than ships which must go around land.īackstay: A wire support for the mast, usually running from the stern to the head of the mast.īackwinded: when the wind hits the leeward side of the sailsīallast: weight in the lower portion of a boat, used to add stability (In a multihull – useless crew on other boats.)īareboat: Bareboat is to sailing as free fall is to skydiving. It can also be used to mean “absent without leave”.Īft – towards the stern of the boat to move aft is to move backĪground – When the hull or keel is against the groundĪnchor – An object designed to grip the ground, under a body of water, to hold the boat in a selected areaĪnchor light: White light displayed by a ship at anchor. Also refers to any gear not fastened down or put away properly. It may also imply that a vessel is not anchored and not under control, therefore goes where the wind and current take her, (loose from moorings, or out of place). Interaction between the two can cause unpredictably high waves and dangers for mariners.Abeam – At right angles to, or beside, the boatĪdrift: Afloat and unattached in any way to the shore or seabed. Sea waves caused by the local wind, are often superimposed on swell moving in from a distance. Since swell may have been instigated by a storm, the arrival of onshore swell can indicate that a storm is approaching. Swell can travel for considerable distances. Swell persists after the disturbance has disappeared and maintains a constant direction as long as it keeps in deep water. Swell is generally regular wave motion caused by large meteorological disturbances operating at a distance. The wind reinforces the wave shape by pressing down on the windward side and eddying over the crest to reduce pressure on the leeward side.Īs wind increases further to around 13 km/h, the crests of the waves steepen until they become unstable and break, producing whitecaps. The crests become more pointed, the troughs rounded. When wind reaches 2.5 km/h, gravity takes over from surface tension as the dominant force on wave form.
Waves created by direct local action of wind on sea are termed 'sea waves' and are measured by length and height. Visit Manly Hydraulics Laboratory for the most up-to-date wave data for these locations. Manly Hydraulics Laboratory provides information on the latest coastal wave heights for:
Sail into the waves meaning drivers#
This information is designed to assist drivers of small vessels to assess the effect of waves at sea.
However wind and waves have a major bearing on performance and, in extreme conditions, can present a considerable threat. Modern well-designed small craft are highly seaworthy.
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