When all the sails are aback.

An unusually strong wind. In storm-warning terminology, a wind of 34 to 47 knots (39 to 54 miles per hour or 62-87 kilometers per hour).

Molten or partially molten rock at temperatures ranging from 1,260 F to 2,880 F (700 C to 1600 C). Some magma bodies are believed to exist at drillable depths within the Earth's crust, although practical technologies for harnessing magma energy have not b ...

Ukraine (Flag)

When from some cause a vessel's form is so altered that the ends of the keel are much above the level of its midship portion, it is said to be "sagged." The opposite of hogged.

Admiralty constant – A coefficient used in the preliminary estimations of the power required in a new design to attain the desired speed. It is presented by the formula: where: D = displacement in tons, V = speed in knots, P = shaft power in kW. Values ...

See gain.

Electronic Chart Display and Information SystemBased on vectorial representation of features, this system is the best available as it can be coupled to many other devices. Unfortunately since the availability of GPS positioning many hydrographic informati ...

An arch to mount the radar, usually at the stern of the boat.

[meaning]

A four sided sail used instead of a triangular main sail. Used on gaff rigged boats.

A pneumatic hand held percussive drill designed as a boring tool.

A gauge that measures engine revolutions per minute.

[meaning]

In radiometry, a measure of the intrinsic radiant intensity emitted by a radiator in a given direction.

When the terms and conditions of a charter party have been agreed, except few minor details.

An absolute temperature scale with the ice point of pure water defined as 273.16 K. The size of the degree is the same as on the Celsius scale, and the zero point is absolute zero.

A Type of Standard Voyage Charter Party Issued by ASBA

To attempt to contact another boat or shore, either by voice or radio.

All the various sails carried on board a yacht.