A method for monitoring a first machine and a second machine , wherein the first machine and the second machine are rotating machines coupled by a drive , and wherein a first sensor device is coupled to the first machine for sensing an operating parameter of the first machine , and wherein a second sensor device is coupled to the second machine for sensing an operating parameter of the second machine , the method comprising: - synchronizing the first sensor device and the second sensor device , wherein the synchronizing is performed by broadcasting a synchronization packet from the first sensor device ; - sensing , by the first sensor device , an operating parameter of the first machine ; - sensing , by the second sensor device , an operating parameter of the second machine , wherein the sensing of the second operating parameter is synchronized to the sensing of the first operating parameter; - broadcasting , by the first sensor device , a data packet comprising the sensed operating parameter of the first machine ; - receiving , by the second sensor device , the data packet sent by the first sensor device ; - calculating , by the second sensor device , a performance indicator from the received operating parameter of the first machine and the sensed operating parameter of the second machine . the first machine and the second machine are rotating machines coupled by a drive , and wherein a first sensor device is coupled to the first machine for sensing an operating parameter of the first machine , and wherein a second sensor device is coupled to the second machine for sensing an operating parameter of the second machine , the method comprising: - synchronizing the first sensor device and the second sensor device , wherein the synchronizing is performed by broadcasting a synchronization packet from the first sensor device ; - sensing , by the first sensor device , an operating parameter of the first machine ; - sensing , by the second sensor device , an operating parameter of the second machine , wherein the sensing of the second operating parameter is synchronized to the sensing of the first operating parameter; - broadcasting , by the first sensor device , a data packet comprising the sensed operating parameter of the first machine ; - receiving , by the second sensor device , the data packet sent by the first sensor device ; - calculating , by the second sensor device , a performance indicator from the received operating parameter of the first machine and the sensed operating parameter of the second machine . - synchronizing the first sensor device and the second sensor device , wherein the synchronizing is performed by broadcasting a synchronization packet from the first sensor device ; - sensing , by the first sensor device , an operating parameter of the first machine ; - sensing , by the second sensor device , an operating parameter of the second machine , wherein the sensing of the second operating parameter is synchronized to the sensing of the first operating parameter; - broadcasting , by the first sensor device , a data packet comprising the sensed operating parameter of the first machine ; - receiving , by the second sensor device , the data packet sent by the first sensor device ; - calculating , by the second sensor device , a performance indicator from the received operating parameter of the first machine and the sensed operating parameter of the second machine . <EOS>