Since a configuration space Q of a relativistic system has no preferable fibration over R , a velocity space of relativistic system is a first order jet manifold J 1 1 Q of one-dimensional submanifolds of Q . The notion of jets of submanifolds generalizes that of jets of sections of fiber bundles which are utilized in covariant classical field theory and non-autonomous mechanics. A first order jet bundle J 1 1 Q → → Q is projective and, following the terminology of Special Relativity, one can think of its fibers as being spaces of the absolute velocities of a relativistic system. Given coordinates ( q 0 , q i ) on Q , a first order jet manifold J 1 1 Q is provided with the adapted coordinates ( q 0 , q i , q 0 i ) possessing transition functions