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36-592: It is bordered by St. Margarets Bay in the west, the open Atlantic Ocean to the south, and Halifax Harbour (including Bedford Basin ) to the east. The peninsula also includes a sub-peninsula - the Halifax Peninsula . The majority of the central part of the Chebucto Peninsula is uninhabited and designated a protected wilderness area to prevent encroaching urban sprawl development. This Halifax County, Nova Scotia location article

72-577: A "Chart 1", which explains all of the symbols, terms and abbreviations used on charts that they produce for both domestic and international use. Each country starts with the base symbology specified in IHO standard INT 1, and is then permitted to add its own supplemental symbologies to its domestic charts, which are also explained in its version of Chart 1. Ships are typically required to carry copies of Chart 1 with their paper charts. Nautical charts must be labeled with navigational and depth information. There are

108-577: A chart may change, and artificial aids to navigation may be altered at short notice. Therefore, old or uncorrected charts should never be used for navigation. Every producer of nautical charts also provides a system to inform mariners of changes that affect the chart. In the United States, chart corrections and notifications of new editions are provided by various governmental agencies by way of Notice to Mariners , Local Notice to Mariners , Summary of Corrections , and Broadcast Notice to Mariners . In

144-468: A danger to vessels navigating over the obstruction. Nautical charts are issued by power of the national hydrographic offices in many countries. These charts are considered "official" in contrast to those made by commercial publishers. Many hydrographic offices provide regular, sometimes weekly, manual updates of their charts through their sales agents. Individual hydrographic offices produce national chart series and international chart series. Coordinated by

180-602: A few commercial software packages that do automatic label placement for any kind of map or chart. Modern systems render electronic charts consistent with the IHO S-52 specification, issued by the International Hydrographic Organization (IHO). The chart uses symbols to provide pilotage information about the nature and position of features useful to navigators, such as sea bed information, sea mark , and landmarks. Some symbols describe

216-470: A new chart if he has not kept track of corrections and his chart is more than several months old. Various Digital Notices to Mariners systems are available on the market such as Digitrace, Voyager, or ChartCo, to correct British Admiralty charts as well as NOAA charts. These systems provide only vessel relevant corrections via e-mail or web downloads, reducing the time needed to sort out corrections for each chart. Tracings to assist corrections are provided at

252-470: A speed of 35 knots (40.3 mph; 64.8 km/h), sustaining serious damage and killing one seaman. In September 2006 the jack-up barge Octopus ran aground on an uncharted sea mount within the Orkney Islands (United Kingdom) while being towed by the tug Harold . £1M worth of damage was caused to the barge and delayed work on the installation of a tidal energy generator prototype. As stated in

288-533: A square is shown as a square everywhere on the chart, but a square on the Arctic Circle appears much bigger than a square of the same size at the equator. In practical use, this is less of a problem than it sounds. One minute of latitude is, for practical purposes, a nautical mile. Distances in nautical miles can therefore be measured on the latitude gradations printed on the side of the chart. Conventional nautical charts are printed on large sheets of paper at

324-452: A variety of scales . Mariners will generally carry many charts to provide sufficient detail for the areas they might need to visit. Electronic navigational charts , which use computer software and electronic databases to provide navigation information, can augment or in some cases replace paper charts, though many mariners carry paper charts as a backup in case the electronic charting system fails. Many countries' hydrographic agencies publish

360-401: A variety of ways. Historically the sounding line was used. In modern times, echo sounding is used for measuring the seabed in the open sea. When measuring the safe depth of water over an entire obstruction, such as a shipwreck , the minimum depth is checked by sweeping the area with a length of horizontal wire . This ensures that difficult to find projections, such as masts , do not present

396-568: Is a stub . You can help Misplaced Pages by expanding it . St. Margarets Bay, Nova Scotia St. Margarets Bay is a bay located on the Atlantic coast of Nova Scotia , Canada on the border of Halifax County ( Halifax Regional Municipality ) and Lunenburg County ( Municipality of the District of Chester ). Opening south directly onto the Atlantic, the bay's eastern shore is formed by

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432-410: Is a graphic representation of a sea region or water body and adjacent coasts or banks . Depending on the scale of the chart, it may show depths of water ( bathymetry ) and heights of land ( topography ), natural features of the seabed, details of the coastline, navigational hazards , locations of natural and human-made aids to navigation , information on tides and currents , local details of

468-456: Is doubtful. Colours distinguish between human-made features, dry land, sea bed that dries with the tide, and seabed that is permanently underwater and indicate water depth. Depths which have been measured are indicated by the numbers shown on the chart. Depths on charts published in most parts of the world use metres. Older charts, as well as those published by the United States government, may use feet or fathoms . Depth contour lines show

504-410: Is the angle between the line joining the two points of interest and the line from one of the points to the north, such as a ship's course or a compass reading to a landmark. On nautical charts, the top of the chart is always true north , rather than magnetic north , towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However,

540-619: The Chebucto Peninsula and its western shore by the Aspotogan Peninsula , while the head of the bay (the northern shore) is the main part of the Nova Scotia peninsula . The bay's shoreline is mostly rocky, although the head of the bay offers several sandy beaches at Queensland, Black Point and Cleveland; another sandy beach exists on the western shore of the bay at Bayswater and there is a small sandy beach along

576-651: The Cunard liner Queen Elizabeth 2 struck a submerged rock off Block Island in the Atlantic Ocean . In November 1999, the semi-submersible , heavy-lift ship Mighty Servant 2 capsized and sank after hitting an uncharted single underwater isolated pinnacle of granite off Indonesia. Five crew members died and Mighty Servant 2 was declared a total loss. More recently, in 2005 the submarine USS San Francisco ran into an uncharted seamount (sea mountain) about 560 kilometres (350 statute miles) south of Guam at

612-563: The Earth's magnetic field , and human-made structures such as harbours , buildings, and bridges. Nautical charts are essential tools for marine navigation ; many countries require vessels, especially commercial ships, to carry them. Nautical charting may take the form of charts printed on paper (raster navigational charts) or computerized electronic navigational charts . Recent technologies have made available paper charts which are printed "on demand" with cartographic data that has been downloaded to

648-400: The International Hydrographic Organization , the international chart series is a worldwide system of charts ("INT" chart series), which is being developed with the goal of unifying as many chart systems as possible. There are also commercially published charts, some of which may carry additional information of particular interest, e.g. for yacht skippers. The nature of a waterway depicted by

684-539: The Mi'kmaq Nation and some contain burial sites. The bay's larger islands are listed below: The Swissair Flight 111 Memorial is located at The Whalesback, a promontory approximately 1 km northwest of Peggys Cove. It is one of two memorials built to commemorate the victims of the Swissair Flight 111 disaster, which crashed into St. Margarets Bay on 2 September 1998. The crash site is roughly equidistant between

720-518: The Aegean, it is unsuitable for seas larger than Mediterranean or an open ocean, even though early explorers had to use it for want of a better. The Mercator projection is now used on the vast majority of nautical charts. Since the Mercator projection is conformal , that is, bearings in the chart are identical to the corresponding angles in nature, courses plotted on the chart may be used directly as

756-481: The Mariners Handbook and subsequent accident report: "No chart is infallible. Every chart is liable to be incomplete". Historically the first projection, invented by Marinus of Tyre ca. AD 100 according to Ptolemy , was what is now called equirectangular projection (historically called plane chart, plate carrée , Portuguese : carta plana quadrada ). While it is very convenient for small seas like

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792-399: The U.S., NOAA also has a printing partner who prints the "POD" (print on demand) NOAA charts, and they contain the very latest corrections and notifications at the time of printing. To give notice to mariners, radio broadcasts provide advance notice of urgent corrections. A good way to keep track of corrections is with a Chart and Publication Correction Record Card system. Using this system,

828-545: The Whalesback Memorial and another memorial at Bayswater, Nova Scotia , located on the Aspotogan Peninsula on the western shore of the bay, opposite Peggys Cove. The monument reads in English and French: "In memory of the 229 men, women and children aboard Swissair Flight 111 who perished off these shores September 2nd, 1998. They have been joined to the sea, and the sky. May they rest in peace." The site of

864-482: The commercial printing company as recently as the night before printing. With each daily download, critical data such as Local Notices to Mariners are added to the on-demand chart files so that these charts are up to date at the time of printing. Nautical charts are based on hydrographic surveys and bathymetric surveys . As surveying is laborious and time-consuming, hydrographic data for many areas of sea may be dated and are sometimes unreliable. Depths are measured in

900-477: The correction of electronic navigational charts. In 1973 the cargo ship MV Muirfield (a merchant vessel named after Muirfield , Scotland ) struck an unknown object in the Indian Ocean in waters charted at a depth of greater than 5,000 metres (16,404 ft), resulting in extensive damage to her keel . In 1983, HMAS Moresby , a Royal Australian Navy survey ship , surveyed the area where Muirfield

936-494: The course-to-steer at the helm. The gnomonic projection is used for charts intended for plotting of great circle routes . NOAA uses the polyconic projection for some of its charts of the Great Lakes , at both large and small scales. Positions of places shown on the chart can be measured from the longitude and latitude scales on the borders of the chart, relative to a geodetic datum such as WGS 84 . A bearing

972-399: The crash and the two monuments form a triangle. The three notches on the monument at Whalesback represent the numerals 111. The sight line from the three grooves in the stone points to the crash site, while the markings on the facing stone point to the memorial at Bayswater. The memorial wall at Bayswater lists the names of the passengers and crew. The facing stone points to the crash site. In

1008-519: The eastern shore on Micou's Island . St. Margarets Bay is a cruising destination for sailing yachts as its picturesque shorelines offer protection in many natural harbours, as well as anchorages in coves and near small islands. Along the Chebucto Peninsula (from south to north): Along the head of the bay (from east to west): Along the Aspotogan Peninsula (from north to south): St. Margarets Bay contains numerous islands, particularly along its eastern shore. These islands were historically used by

1044-406: The full tidal cycle, but in non-tidal areas and some tidal areas Mean Sea Level (MSL) is used. Heights, e.g. a lighthouse, are generally given relative to mean high water spring (MHWS). Vertical clearances, e.g. below a bridge or cable, are given relative to highest astronomical tide (HAT). The chart will indicate what datum is in use. The use of HAT for heights and LAT for depths, means that

1080-421: The navigator does not immediately update every chart in the portfolio when a new Notice to Mariners arrives, instead creating a card for every chart and noting the correction on this card. When the time comes to use the chart, he pulls the chart and chart's card, and makes the indicated corrections on the chart. This system ensures that every chart is properly corrected prior to use. A prudent mariner should obtain

1116-838: The period between World War I and World War II , the US military drew up a series of Colour Coded War Plans based on likely global threats. War Plan Red denoted a planned attack against the British Empire and by extension War Plan Crimson which called for an invasion of Canada. The plan involved an attack on many fronts starting with a seabourne invasion of Halifax and Canada's Maritime provinces via St. Margarets Bay. Nautical chart #4386 St. Margarets Bay , published by Canadian Hydrographic Service , 2004 44°35′N 64°00′W  /  44.583°N 64.000°W  / 44.583; -64.000  ( St. Margarets Bay ) Nautical chart A nautical chart or hydrographic chart

Chebucto Peninsula - Misplaced Pages Continue

1152-585: The same time. The Canadian Coast Guard produces the Notice to Mariners publication which informs mariners of important navigational safety matters affecting Canadian Waters. This electronic publication is published on a monthly basis and can be downloaded from the Notices to Mariners (NOTMAR) Web site. The information in the Notice to Mariners is formatted to simplify the correction of paper charts and navigational publications. Various and diverse methods exist for

1188-404: The sea bed with information such as its depth, materials as well as possible navigational hazards such as shipwrecks . Other symbols show the position and characteristics of navigational aids such as buoys , lights , lighthouses , coastal and land features and structures that are useful for position fixing . The abbreviation "ED" is commonly used to label geographic locations whose existence

1224-403: The shape of underwater relief . Coloured areas of the sea emphasise shallow water and dangerous underwater obstructions. Depths are measured from the chart datum , which is related to the local sea level. The chart datum varies according to the standard used by each national Hydrographic Office . In general, the trend is towards using lowest astronomical tide (LAT), the lowest tide predicted in

1260-423: The use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel. On the real globe, the lines of longitude converge as they approach the north or south pole. This means that east–west distances are exaggerated at high latitudes. To keep the projection conformal, the projection increases the displayed distance between lines of latitude (north–south distances) in proportion; thus

1296-554: Was damaged, and charted in detail a previously unsuspected hazard to navigation, the Muirfield Seamount . The dramatic accidental discovery of the Muirfield Seamount is often cited as an example of limitations in the vertical geodetic datum accuracy of some offshore areas as represented on nautical charts, especially on small- scale charts. A similar incident involving a passenger ship occurred in 1992 when

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