LORA technology is increasingly used for white zone communications. The access to the channel for the different nodes of the network is managed in various ways. We propose an algorithm based on a controlled sliding backoff for communication in a maritime environment: the case of Senegal. Indeed, fishing activities in Senegal are carried out in an offshore environment, without network coverage and therefore without means of communication in case of danger. We define different communication phases according to the type of information to be transmitted, and analyze the network behavior thanks to mathematical equations. Simulations are used to set parameters and determine the duration of each communication phase.