lunivore

St. James's Park: 51.49954,-0.13358
Trafalgar Square: 51.508039,-0.128069
Buckingham Palace: 51.501364,-0.14189

lunivore

class GpsCalculator
  def distance loc1, loc2
    rad_per_deg = Math::PI/180  # PI / 180
    rkm = 6371                  # Earth radius in kilometers
    rm = rkm * 1000             # Radius in meters

    dlat_rad = (loc2[0]-loc1[0]) * rad_per_deg  # Delta, converted to rad
    dlon_rad = (loc2[1]-loc1[1]) * rad_per_deg

    lat1_rad, lon1_rad = loc1.map {|i| i * rad_per_deg }