Do I need a licence / registration number or not? According to the Ordinance on Navigation on Swiss Waters (Inland Navigation Ordinance, BSV) Art. 16 Marking 1 Vessels which are stationed on or above a water surface or which are used on a public water body must be marked with the number plates allocated by the competent authority in accordance with Annex 1. in accordance with Annex 1. 2 Exempted from this are: a. Vessels of federally licensed shipping companies; b. Vessels shorter than 2.50 m; c. Beach boats and the like; d. paddle boats, racing rowing boats, sail boards and kite sail boards. 3 Vessels in accordance with paragraph 2 letter a. shall bear a vessel's name, which may consist of letters and numbers. letters and numbers. Vessels in accordance with paragraph 2 letters b-d shall bear the name and address of the owner or keeper in a clearly visible manner. Here, however, it is written of 4 m, which is correct?