- The CISR will accept marking of the external Ship Identification Number in line with the requirements for passenger ships. That is, the external marking may be on a horizontal surface visible from the air, providing the marking is clear of awnings and other obstructions. For yachts, transfers will be considered an acceptable method for externally marking the Ship Identification Number; provided these are clearly visible, clear of any other markings on the hull and of a contrasting colour to the hull.
When marking the Ship Identification Number internally in the machinery space, the following methods are considered acceptable:
| Steel Hull | Aluminium Alloy Hull | GRP / FRP Hull |
|---|---|---|
| Raised lettering by welding or centre punching. | Raised lettering by welding or centre punching. | Raise lettering mechanically fastened to the ships structure by means of bolts, screws etc or laminated. |
The size of the markings shall be in accordance with SOLAS XI-1/3.