The islands are all exposed to wind and tide and various lighthouses, such as those on Ailsa Craig, Pladda and Davaar act as an aid to navigation.

Using a chronometer to aid navigation simply saved lives and ships — the insurance industry, exercise of self-interest, and common sense did the rest in making the device a universal tool of maritime trade.

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses and used as an aid to navigation for maritime pilots at sea or on inland waterways.

Lighthouses are sited as an aid to navigation at various locations.

Recent evidence suggests that the Vikings also made use of an optical compass as a navigation aid, using the light-splitting and polarization-filtering properties of Iceland spar to find the location of the sun when it was not directly visible.

Knowledge of topics such as navigation, meteorology, mechanical and electrical systems, radio, first aid, sea survival, nutrition and more are needed and can be life saving when cruising to distant shores.

The altimeter is an instrument optional in off-road vehicles to aid in navigation.

Though the nomenclature may initially confuse new arrivals and visitors, most consider the grid system an aid to navigation.

It had parallel lines of longitude to aid navigation by sea, and compass courses could be marked as straight lines.

It was widely used throughout the Muslim world, chiefly as an aid to navigation and as a way of finding the Qibla, the direction of Mecca.

The Île de Patiras is 200 ha in size with a lighthouse to aid navigation in the estuary.

Attempts have been made to bring it into more general use, but without success ; and it is only in particular circumstances that navigation, with the aid either of locks or inclined planes to surmount the elevations, will not present a more convenient medium for an extended trade.

The lighthouse's beacon was turned off in the 1940s, and the structure is no longer an important navigation aid for lake freighters, although small boaters still refer to the location.

Upstream from the fall line, which marked the western reaches of the coastal plain of Virginia ( and adjacent areas of North Carolina ), canals and other improvements were constructed to aid navigation upriver by batteaux and other watercraft.

The Harbour Light Tower was built in 1817 ; until then, the Signal House was used by boats as an aid to navigation.

In 1847 the Congress of the United States built the Vermilion Lighthouse to aid navigation on Lake Erie.

After studying at Leeds Grammar School he joined his father's law firm, but left to become a mathematical instrument maker ( working with Henry Hindley ), developing, among other instruments, a pyrometer to study material expansion and a whirling speculum or horizontal top ( a maritime navigation aid ).

Improvements to aid navigation began in 1635, and a series of locks and weirs made it possible to reach Stratford, and to within of Warwick.

Unlike oceanography, hydrography will include shore features, natural and manmade, that aid in navigation.

As well as an aid to navigation ( most larger vessels will have at least a simple depth sounder ), echo sounding is commonly used for fishing.

The Ockham Beacon at the East end of the airfield still serves as a navigation aid for aircraft flying over the area today.

In the United States, commercial AM radio stations were required to broadcast their station identifier once per hour for use by pilots and mariners as an aid to navigation.

The bay was home to the Lightship Rose which provided a permanent navigation aid to passing ships at the mouth of the Brisbane River.

The first navigation aid, GEE, was introduced to help pilots to find their targets.

His famous Letter from Jamaica, though ostensibly written to one man, was an appeal to Great Britain specifically and the European powers in general to aid the cause of Spanish American independence, but it found no significant response.

In the meantime, Bolívar chose to sail to Jamaica to enlist British aid, which was refused.

After the executions, the British vice-consul at Santiago, concerned that one of the mercenaries killed, George Washington Ryan, claimed British citizenship, wired Jamaica to receive aid from the British navy to stop further executions.

He spent time working for a Canadian aid agency in Jamaica before becoming a junior high teacher for the Scarborough Board of Education for several years.

Her most famous brother, Cudjoe, went on to lead several slave rebellions in Jamaica with the aid of her other brothers.

Countries and organizations that offered to send aid mentioned by the State Department included Afghanistan, Argentina, Armenia, Australia, Austria, Azerbaijan, the Bahamas, Bahrain, Bangladesh, Belarus, Belgium, Bosnia and Herzegovina, Canada, Chile, Colombia, Cuba, the Czech Republic, Denmark, Dominica, Dominican Republic, Ecuador, El Salvador, the European Union, Finland, France, Georgia, Germany, Greece, Guatemala, Guyana, Honduras, Hungary, Iceland, India, Indonesia, International Energy Agency, International Federation of Red Cross and Red Crescent Societies, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kosovo, Kuwait, Lithuania, Luxembourg, Mexico, NATO, Nepal, the Netherlands, New Zealand, Nicaragua, Nigeria, Norway, Organization of American States, Oman, OPEC, Pakistan, Paraguay, the Philippines, Poland, Portugal, Qatar, Romania, Russia, Saudi Arabia, Singapore, Slovakia, Slovenia, South Korea, Spain, Sri Lanka, Sweden, Switzerland, Taiwan, Thailand, Tunisia, Turkey, UAE, United Kingdom, the United Nations, United Nations High Commissioner for Refugees, Venezuela and the World Health Organization.

The church operates numerous schools, hospitals and publishing houses worldwide, as well as a humanitarian aid organization known as the Adventist Development and Relief Agency ( ADRA ).

CNNMéxico said that although the Yakuza operates through extortion and other violent methods, they are also " swiftly and quietly to provide aid to those most in need.

" Operation Blessing operates on a daily basis in 23 countries around the world, implementing programs that provide strategic disaster relief, medical aid, hunger relief, clean water and community development.

While each school's financial aid system operates differently, there is a rule of thumb relating to GPA and LSAT scores: a student whose grades and LSAT are higher than those of most students admitted to a given school — in other words, a student who could go to a " better " school — has a good chance of being offered some kind of scholarship by the lower-ranked school.

The department also operates a Paramedic Ambulance service and serves the people of the village and town of Canton as well as providing mutual aid services to surrounding towns.

CIDA administers foreign aid programs in developing countries, and operates in partnership with other Canadian organizations in the public and private sectors as well as other international organizations.

On February 28, 2010, the Brazilian Navy ship Garcia D ' Ávila ( G29 ), sailed from Rio de Janeiro with 900 tons of cargo, including humanitarian aid supplies to earthquake victims in Haiti as well as equipment for the Brazilian military that operates in that country.

As an associate unit, the 507 ARW also operates the Federal Aviation Administration's FAA's British Aerospace Hawker 125-800 aircraft ( ex-USAF C-29A ) in the aviation standards and navigational aid inspection mission.

BUSU also operates Brock Aid, which is a first aid responders team that provides emergency medical response during BUSU events.

" S²arch-Social Sustainable Architecture " that operates aid projects in South Africa

For this reason it operates as a charity, and all funds generated by ticket sales aid the museum in putting new exhibitions together.

As a charitable endeavor, the association operates the Romanov Fund for Russia to raise money for aid projects in Russia.

It operates cargo and passenger air services for humanitarian aid provided by UN MovCon, WFP, UNICEF, UNOPS, ESS, MSF, FAO and IRC, using aircraft and helicopters covering most areas of Sudan.

The county fire department operates ten stations and is a signatory to an automatic regional response plan with neighboring Fairfax County as well as the city of Alexandria, and participates in a regional mutual aid pact with the District of Columbia and the Maryland counties of Montgomery and Prince George ’ s.