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The QRA locator, also called QTH locator in some publications, is an obsolete geographic coordinate system used by amateur radio operators in Europe before the introduction of the Maidenhead Locator System. As a radio transmitter or receiver location system the QRA locator is considered defunct, but may be found in many older documents.
The QRA locator system was limited to describing European coordinates, and by the mid-1970s there was growing need for a global locator system. [3] By the time of their April 1980 meeting, in Maidenhead, England, the VHF Working Group had received twenty different proposals to replace the QRA locator grid. That devised by John Morris (G4ANB ...
Quick Reaction Alert (QRA) is state of readiness and modus operandi of air defence maintained at all hours of the day by NATO air forces. The United States usually refers to Quick Reaction Alert as 'Airspace Control Alert'. Some non-NATO countries maintain a QRA, [1] either full-time or part-time. [2] [3]
The QRA–QUZ code range includes phrases applicable to all services and is allocated to the International Telecommunication Union. [8] QVA–QZZ are not allocated. [ 9 ] Many codes have no immediate applicability outside one individual service, such as maritime operation (many QO or QU series codes) or radioteletype operation (the QJ series).
QDGC - Quarter Degree Grid Cells (or QDS - Quarter degree Squares) are a way of dividing the longitude latitude degree square cells into smaller squares, forming in effect a system of geocodes.
The Military Grid Reference System (MGRS) [1] is the geocoordinate standard used by NATO militaries for locating points on Earth. 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 World Geographic Reference System (GEOREF) is a geocode, a grid-based method of specifying locations on the surface of the Earth.GEOREF is essentially based on the geographic system of latitude and longitude, but using a simpler and more flexible notation.
QRA may refer to: Quantile regression averaging, in econometrics and forecasting; Quantitative risk assessment, an estimation of risk; Quaternary Research Association, associated with the Journal of Quaternary Science; Queensland Regional Airlines, a defunct Australian airline; Quick Reaction Alert, a NATO state of readiness in military aviation