| Summary: | The KM3NeT Collaboration is the largest team of scientists and engineers operating the largest deep-sea research infrastructure being built in the Mediterranean Sea, incorporating a network of next-generation neutrino telescopes and devices for multidisciplinary science. KM3NeT is scaling two underwater infrastructures housing large-scale neutrino detectors that share the same technology but with different layouts and scientific targets. These detectors are so-call ORCA (Oscillation Research with Cosmics in the Abyss) and ARCA (Astroparticle Research with Cosmics in the Abyss). ARCA is located at the KM3NeT-It site (Capo, Passero, Italy), and ORCA is in the KM3NeT-Fr site (Toulon, France). The detection principle is based on the recording of Cherenkov light when induced by relativistic charged particles produced in neutrino interactions while crossing the detectors. Each detector comprises a 3D array of Detection Units (DUs) in a modular design. Each DU comprises 18 Digital Optical Modules (DOM), and each DOM contains 31 3-inches PhotoMultiplier Tubes (PMT) responsible for recording the Cherenkov light. Each DOM collects information that allows the reconstruction of the direction, energy range, and timing of neutrino-like events. The detectors work in an all-data-to-shore data transfer mode for the subsequent analysis of this information. Knowing each DOM’s orientation is crucial to determine the directionality of the events of interest in KM3NeT. Within each DOM, specifically in the so-called CLB, a compass board is integrated with a 3D-accelerometer and a 3D-magnetometer, in charge of tilt and orientation readout (Yaw, Pitch, and Roll). In addition, an offline calibration procedure was defined for the compass positioning subsystem, identifying the necessary calibration parameters to mitigate uncertainties linked to the device. In this work, the uncertainties estimation for the KM3NeT compass positioning subsystem is studied, and a preliminary parameterization is proposed. As a result, it is verified that the ...
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