NGR Converter

NGR Converter is a National Grid Reference to latitude and longitude converter.
NGR Converter widget converts between British National Grid References, latitude and longitude, and IARU Locators.
Now, with NGR Converter widget you can easily convert the info you need.
The uppermost box is used for the entry and display of National Grid References.The middle two boxes are used for the entry and display of latitudes and longitudes.
The lowest box is for the entry and display of IARU Locators. It is also used for the display of convergences and scales.
National Grid References can be entered in either a numeric or an alphanumeric format.The numeric format should be a comma-separated pair of eastings and northings where both are in metres from the (false) origin.
The alphanumeric format can be a 2, 4, 6, 8 or 10 figure National Grid Reference with a two letter prefix.References can be entered in either format, but there are preferences to specify the format used for display.
There are also preferences to compute convergences and scales.
The National Grid coordinate system is based on the Airy 1830 ellipsoid and a Terrestrial Reference Frame (TRF) called OSGB36
(Ordnance Survey Great Britain 1936).
Requirements:
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