![]() ![]() The first part of an MGRS coordinate is the grid-zone designation. ![]() Grid zone designation UTM zones on an equirectangular world map with irregular zones in red and New York City's zone highlighted GZD and 100 km Grid Square ID, precision level 100 km ![]() GZD only, precision level 6° × 8° (in most cases) In instances where the polygon is not a square and has been clipped by a grid zone junction, the polygon keeps the label of the southwest corner as if it had not been clipped. Related to this is the primacy of the southwest corner of the polygon being the labeling point for an entire polygon. When changing precision levels, it is important to truncate rather than round the easting and northing values to ensure the more precise polygon will remain within the boundaries of the less precise polygon. (In some cases, squares adjacent to a Grid Zone Junction (GZJ) are clipped, so polygon is a better descriptor of these areas.) The number of digits in the numerical location must be even: 0, 2, 4, 6, 8 or 10, depending on the desired precision. When the term 'grid square' is used, it can refer to a square with a side length of 10 km (6 mi), 1 km, 100 m (328 ft), 10 m or 1 m, depending on the precision of the coordinates provided. 1234 5678 (numerical location easting is 1234 and northing is 5678, in this case specifying a location with 10 m resolution)Īn MGRS grid reference is a point reference system.FJ (the 100,000-meter square identifier).The MGRS is used as geocode for the entire Earth.Īn example of an MGRS coordinate, or grid reference, would be 4QFJ12345678, which consists of three parts: The MGRS is derived from the Universal Transverse Mercator (UTM) grid system and the Universal Polar Stereographic (UPS) grid system, but uses a different labeling convention. The boat’s exact position was required for launching ballistic missiles.The Military Grid Reference System ( MGRS) is the geocoordinate standard used by NATO militaries for locating points on Earth. Information about the ship’s position, speed, heading, and attitude were constantly transmitted from the SINS to the missile fire-control system. Manufactured by the Autonetics Marine Systems Division of Rockwell International (now Boeing), the SINS was installed on the boat in 1983 and removed in 2006 after over 60 patrols. The Alabama has three inertial guidance units. Ship’s Inertial Navigation System (SINS) Stable Platform and Housing Assembly It has since been fitted with a GPS receiver and the Trident II navigation system. The Alabama was built with three navigation systems: the ship’s inertial navigation system (SINS), a Loran-C receiver, and a Transit satellite receiver system for correcting the inertial system. From the 1960s to the 1990s, Transit satellites and LORAN shore stations provided those signals. To maintain accuracy, the submarine must periodically update its position using outside navigational radio signals. Because it does not rely on radio signals or celestial sightings, it allows the boat to navigate while remaining hidden under the surface. Submarines carry an inertial navigation system, which measures the boat’s motion and constantly updates position. Submarines used radio signals to correct their inertial navigation systems. ![]()
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