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 (240, 130), 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 (240, 130), 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 (240, 130), 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.