The ANTOISE sensor measures the inclination, orientation and positioning with an accuracy of 3 cm (within 1 inch).
It is composed of three GPS receivers in 2 units, one "base" GPS receiver positioned on a point of exact known coordinates.
It corrects the measurement of a second unit, the GPS "machine." It is composed of a metal support equipped with 2 receivers and a case containing the electronic computing. One of the receivers is used as the positioning reference, the other to determine the orientation; the assembly is placed on the mast.