private double averageLongitude() {
		double totalLongitude = 0.0;
		double nbrOfLocations = locations.size();
		for(int i = 0; i < nbrOfLocations; i++) {
			totalLongitude += locations.get(i).getLongitude();
		}

		double averageLongitude = nbrOfLocations != 0 ? totalLongitude / nbrOfLocations : 0.0; 
		return averageLongitude;
	}