Navigation device and method using correction data in a remote imu

A navigation device comprising an inertial measurement unit and an electronic navigation calculation unit that are connected to each other by a data link, the inertial measurement unit comprising inertial sensors for producing location signals, and the electronic navigation calculation unit being arranged to calculate a navigation from the location signals, wherein the inertial measurement unit comprises an electronic processing circuit that is connected to the inertial sensors and provided with a memory containing an error model of the inertial measurement unit;

• in that the electronic processing circuit is arranged to transmit to the electronic navigation unit, firstly, at a first rate, said location signals and, secondly, at a second rate, correction signals comprising first correction data, which are representative of an impact of the sensor errors on the location signals over a given period and which are determined by the electronic processing circuit on the basis of the error model, and second correction data, which are representative of an effect of the random noises and errors of the inertial measurement unit over the given period;
• and in that the electronic navigation calculation unit implements a hybrid navigation algorithm arranged to supply a hybrid location that is based on inertial location data extracted from the location signals and from the external location data and that is readjusted on the basis of the correction data.