1. A device for making centrally available, navigation parameter values of a vehicle, comprising a plurality of components distributed in the following categories: a plurality of sensors that collect measurement data relating to at least one navigation parameter of the vehicle, wherein the plurality of sensors includes a first sensor configured to sense a selected navigation parameter using a first sensor operation mode and a second sensor configured to sense the selected navigation parameter using a second sensor operation mode different from the first sensor operation mode such that a common mode failure affecting the first sensor will not affect the second sensor; a plurality of computers that process the measurement data collected by the plurality of sensors and calculate said at least one navigation parameter of the vehicle, wherein the plurality of computers includes a first computer configured to process the measurement data collected by the first sensor and the second sensor and calculate the selected navigation parameter using a first computer operation mode and a second computer configured to process the measurement data collected by the first sensor and the second sensor and calculate the selected navigation parameter using a second computer operation mode different from the first computer operation mode such that a common mode failure affecting the first computer will not affect the second computer; a plurality of networks that link the sensors to the plurality of computers and link the plurality of computers to a plurality of user systems using said at least one navigation parameter of the vehicle, wherein the plurality of networks includes a first network that links the first and second sensors to the first and second computers using a first network operation mode and a second network that links the first and second sensors to the first and second computers using a second network operation mode different from the first network operation mode such that a common mode failure affecting the first network will not affect the second network; wherein: the plurality of networks transmit all the collected measurement data to the plurality of computers, and the plurality of computers calculate and make available, for use by the plurality of user systems, the value for each of the at least one navigation parameter of the vehicle as well as an estimated value of a fault associated with said at least one navigation parameter of the vehicle, using the transmitted measurement data and a single fusion algorithm contained in each of said plurality of computers.