The present invention relates to a non-invasive method for assessing the digestive motility or transit of a subject, comprising: swallowing a non digestible transmitting element which contains a transmission means transmitting at a given fixed frequency measuring in series the phase-shift of the frequency transmitted by each of transportable reception means, relative to a reference phase of a reference beacon, to fix the origin of a coordinates system and the coordinates of each transportable reception means in said system, each reception means comprising at least a transceiver, said reception means being distributed around said subject, and said reference beacon being attached to a given fixed location on said subject, measuring then, using said transportable reception means distributed around said subject, the phase shift of the frequency transmitted by said transmission means of said ingestible element determining by triangulation a position of said ingestible element in said coordinates system.
