Method for monitoring the time of use of a generator set, said method being able to provide at least information characteristic of an operating time of said generator set, said method using an autonomous measuring device carrying at least two sensors, said method comprising the following steps, implemented by said autonomous device, when it is attached to a frame of said generator set: - measuring a first physical quantity, using a first of said sensors; - measuring a second physical quantity, using a second of said sensors; - analysing said first and second physical quantities, delivering information representing an operating state of said generator set; - determining information representing an overall operating time of said generator set, by cumulative time during which said information representing an operating state is delivered, - storing said information representing an overall operating time of said generator set, and - transmitting said information characteristic of an overall operating time, from said autonomous device to data processing means, when said autonomous device is connected to said data processing means, characterised in that said method furthermore comprises a step of obtaining location data of said generator set and in that said transmission step comprises a sub-step of transmitting at least one of said location data of said generator set, so as to identify said generator set. being able to provide at least information characteristic of an operating time of said generator set, said method using an autonomous measuring device carrying at least two sensors, said method comprising the following steps, implemented by said autonomous device, when it is attached to a frame of said generator set: - measuring a first physical quantity, using a first of said sensors; - measuring a second physical quantity, using a second of said sensors; - analysing said first and second physical quantities, delivering information representing an operating state of said generator set; - determining information representing an overall operating time of said generator set, by cumulative time during which said information representing an operating state is delivered, - storing said information representing an overall operating time of said generator set, and - transmitting said information characteristic of an overall operating time, from said autonomous device to data processing means, when said autonomous device is connected to said data processing means, - measuring a first physical quantity, using a first of said sensors; - measuring a second physical quantity, using a second of said sensors; - analysing said first and second physical quantities, delivering information representing an operating state of said generator set; - determining information representing an overall operating time of said generator set, by cumulative time during which said information representing an operating state is delivered, - storing said information representing an overall operating time of said generator set, and - transmitting said information characteristic of an overall operating time, from said autonomous device to data processing means, when said autonomous device is connected to said data processing means, characterised in that said method furthermore comprises a step of obtaining location data of said generator set and in that said transmission step comprises a sub-step of transmitting at least one of said location data of said generator set, so as to identify said generator set.