A method for setting up a maritime high speed broadband communication network between several users, such as vessels, aircrafts, helicopters, platforms or similar cooperating in a maritime Simultaneous operation, which users are provided with a user unit including a user control unit, communication means, an interface unit and a user interface, wherein the method includes the following steps: a) each user performs, by means of a phase steerable antenna generating one narrow lobe, a scan of the horizon for other users or issues an interrogation message and ask if other users are operative and what their position, heading and velocity and user identification are, b) forming a network via which the users can communicate directly with each other by that each user sets up a database including operative users and theirs position, heading and velocity, c) measuring signal strength, signal-to-noise ratio, data throughput and other transmission parameters, such as Bit Error Rate and re-transmission rate, and calculating optimized transmission parameters, directly from one user to another user, d) optimizing the direction of the narrow lobe of the steerable antenna in both azimuth and elevation for best possible data throughput for each user directly to the respective other users, e) reducing interference from reflected signals from sea or other surfaces by that receiving and transmitting user are calculating direction and position of a reflection point based on position of the transmitting and receiving user, distance between transmitting and receiving user and antenna height at both sides, and generating one or more nulls in the phase steerable antenna's diagram in direction of the reflection point, f) controlling/steering the phase steerable antennas for users communicating directly with each other based on optimized transmission parameters from step c), antenna lobe directions from step d) and antenna diagram with one or more nulls from step e) to achieve high gain in both azimuth and elevation for the generated narrow lobes, g) at predefined periods repeat steps a)-f). a) each user performs, by means of a phase steerable antenna generating one narrow lobe, a scan of the horizon for other users or issues an interrogation message and ask if other users are operative and what their position, heading and velocity and user identification are, b) forming a network via which the users can communicate directly with each other by that each user sets up a database including operative users and theirs position, heading and velocity, c) measuring signal strength, signal-to-noise ratio, data throughput and other transmission parameters, such as Bit Error Rate and re-transmission rate, and calculating optimized transmission parameters, directly from one user to another user, d) optimizing the direction of the narrow lobe of the steerable antenna in both azimuth and elevation for best possible data throughput for each user directly to the respective other users, e) reducing interference from reflected signals from sea or other surfaces by that receiving and transmitting user are calculating direction and position of a reflection point based on position of the transmitting and receiving user, distance between transmitting and receiving user and antenna height at both sides, and generating one or more nulls in the phase steerable antenna's diagram in direction of the reflection point, f) controlling/steering the phase steerable antennas for users communicating directly with each other based on optimized transmission parameters from step c), antenna lobe directions from step d) and antenna diagram with one or more nulls from step e) to achieve high gain in both azimuth and elevation for the generated narrow lobes, g) at predefined periods repeat steps a)-f).