Mae eisoes gofyn ar bysgotwyr i osod dyfais o’r fath ar gychod 12m a mwy ond mae Gorchymyn yn dod i rym heddiw sy’n golygu bod cychod llai, mwy na 350 ohonyn nhw, yn gosod dyfais o’r fath.
Boats 12m or more in length were already required to have such a system in place, but an Order coming into force today means those under this size, more than 350 boats, must have a VMS device.