Patent ID: 8779934

Claim:
A method for generating proximity warnings on an area by means of a monitoring apparatus comprising a plurality of monitoring devices, wherein at least some of said monitoring devices are installed on objects operating in said area, wherein at least part of said monitoring devices comprise a receiver for a radio based positioning system and a radio circuit, said method comprising the steps of: mounting, to at least one movable first object in said area, a first and a second monitoring device at a distance from each other, generating, by means of said first monitoring device, a first device status dataset depending on a position of said first monitoring device, generating, by means of said second monitoring device, a second device status dataset derived from a position of said second monitoring device, encoding, in said second device status dataset, data indicating that the second monitoring device is an auxiliary device and its device status dataset can therefore be ignored by any other devices with the exception of a main device attributed to said second monitoring device, emitting said second device status dataset through the radio circuit of said second monitoring device, receiving, by said first monitoring device, said second device status dataset, deriving, in said first monitoring device, from a position of said first monitoring device and from said second device status dataset, a reserved, non-circular volume of space attributed to said at least one movable first object and encoding said non-circular volume of space in said first device status dataset, and broadcasting said first device status dataset through the radio circuit of said first monitoring device to other monitoring devices.