A method and system for communicating between a first item of equipment and one or more other items of destination equipment implemented through a communication network, each item of equipment being identified on the communication network via an identifier based on its geographical coordinates. The method includes dispatching a message via the first item of equipment to each destination item of equipment, the message being in accordance with a determined communication protocol and including a first item of information defining a zone of influence corresponding to a determined geographical zone with respect to which each item of destination equipment determines whether the message is relevant to it.