sea level - The average level of the oceans, used when finding water depths or land elevations.
sea room - Room for a boat to travel without danger of running aground.
The increase in mean sea level caused by the "piling up" of water on the coastline by wind.
Windward
Upwind, or the direction from which the wind is blowing: the opposite of leeward.
Also called barometric pressure. The weight of the atmosphere, an average of 1013.2 millibars or 29.2 inches of mercury at sea level. Measuring the changes in atmospheric pressure can help predict weather.
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Brash:
Ice broken into pieces, and projecting very little above sea level.
separation of masthead lights of power-driven vessels shall be such that in all normal conditions of trim the after light will be seen over and separate from the forward light at a distance of 1000 meters from the stem when viewed from sea level.
Major damage to lower floors of all structures located less than 15 ft above sea level and within 500 yards of the shoreline. Massive evacuation of residential areas on low ground within 5-10 miles (8-16 km) of the shoreline may be required.
a short but appealing rake and the reverse transom allows for easy-access swim steps. The cabintrunk blends beautifully into the hull, especially the low-slung forward section that is partially hidden by the raised bulwark when viewed from sea level.
 See also: Heading, Hoist, Secure, Sailboat, Spring
  
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