A turbomachine includes a high-pressure spool, an axial compressor of axis X mounted on a rotor and including a casing and at least one rear bearing disposed between the casing and the rotor of the compressor. The register is configured to store a map relating distinct regions of a memory to respective mapping modes. in a jack-up state, on a sloping site and so on. Alternately, the illumination source may be fabricated as an array of light emitting diodes selected to cover a range of separate wavelengths.