function MapGrid_Labels, orientation, location, fractional, defaultlabel

  if (location eq 0) then $
    return, orientation ? 'Equator' : 'Prime!CMeridian'

  degree = '!M' + STRING(176b) ; Use the Math symbol
  ;label = STRTRIM(ROUND(ABS(location)),2) + degree
  label = STRING(location,format='(F8.1)') + degree
  suffix = orientation ? ((location lt 0) ? 'S' : 'N') : $
    ((location lt 0) ? 'W' : 'E')

  return, label + suffix
end