The GSM kit is an additional alarming, including a quad band GSM modem and a suitable mobile telephone antenna. The system transmits clear text status information to a mobile phone number at arising of an alarm in order to inform a captain, skipper or owner about the incident. It is connected via serial line to a monitor with integrated PC (for example AHD 1215) of the Böning alarm system. The data transmission of the information is performed by short message service (SMS). All kind of standard mobile telephones are supported. A special application (App) on the mobile telephone is not required.