Convert NMEA GPS data from decimal-decimal format to decimal-degree

nmea2gps.js

function NMEA2GPS(num, pole){
  var poles = {'N':1,'S':-1,'W':-1,'E':1};
  var s = parseFloat(num).toString();
  var deg = s.substring(0,2);
  var min = s.substring(2);
  return (parseInt(deg) + parseFloat(min)/60) * poles[pole];
}

// NMEA2GPS(07721.2060, 'W') => -77.35347