  The nonlinear Schroedinger equation with a third-order dispersive term is
considered. Infinite families of embedded solitons, parameterized by the
propagation velocity, are found through a gauge transformation. By applying
this transformation, an embedded soliton can acquire any velocity above a
certain threshold value. It is also shown that all these families of embedded
solitons are linearly stable, but nonlinearly semi-stable.
