Keywords: Garmin GPS at Greenwich Observatory.jpg Royal Observatory Greenwich indicating that the WGS 84 reference meridian is 0 089 arcminutes or about 5 3 arcseconds to the east of the Prime Meridian about 100 meters at the indicated latitude own Brian Dell 2010-06-11 51 477917 -0 001483 region GB_heading S Prime meridian in Greenwich Garmin GPSmap series |