MOD is a portable system for reducing motion sickness, specifically developed for maritime use. Motion sickness remains one of the most common and restrictive problems at sea, affecting the comfort, performance, and safety of both recreational sailors and professional crews. MOD addresses this problem through subtle stimulation of the vestibular system using synchronized micro-vibrations and local thermal modulation. This is intended to reduce sensory conflicts without demanding the user’s attention. The system integrates ergonomically around the dominant ear and works unobtrusively in the background. In this way, MOD positions itself as a calm, human-centered tool that supports stability and well-being in dynamic maritime environments.