Relevant class notations:

• TMON: Tailshaft monitoring
  Tailshaft condition monitoring arrangement to be able to check the status of the stern tube and tailshaft without any dismantling of parts.

• E0: Periodically unattended machinery space
  The rules in this chapter apply to machinery spaces where arrangements are provided to ensure that the safety of the ship in all sailing conditions, including manoeuvring, and when alongside is equivalent to that of a ship having machinery spaces attended.

• DYNPOS: Dynamic positioning
  This notation indicates the vessel's ability to stay in position under different conditions, especially weather conditions. The DNV dynamic positioning service is represented by the additional DYNPOS class notations:

  • DYNPOS-AUTS
    A dynamic positioning system without redundancy

  • DYNPOS-AUT
    
    A dynamic positioning system with an independent joystick backup and a positioning reference backup. Equivalent to IMO equipment class 1.

  • DYNPOS-AUTR
    
    A dynamic positioning system with redundancy in technical design and with an independent joystick backup. Equivalent to IMO equipment class 2.

  • DYNPOS-AUTRO
    A dynamic positioning system with redundancy in technical design and with an independent joystick backup. In addition, a backup DP-control system is installed in an emergency DP-control centre, designed with physical separation for components that provide redundancy. Equivalent to IMO equipment class 3.
    

• RP/RPS: Redundant propulsion
  Applies to vessels where the propulsion machinery, the steering gear and their auxiliary systems are built to give a fully redundant propulsion system and steering system. Vessels built and tested in compliance with the requirements of this document and the requirements of the main class rules may be assigned one of the following additional class notations:
  RP - Redundant Propulsion, or RPS - Redundant Propulsion and Separate.

• ICE/Polar/Icebreaker: Ice class
  Applies to vessels intended for service in icy waters with everything from light ice conditions to ice breaking and ramming.

  • ICE-05 – Vessels breaking ice of 0.5 m level thickness.

  • ICE-10 – Vessels breaking ice of 1.0 m level thickness.

  • ICE-15 – Vessels breaking ice of 1.5 m level thickness.

  • ICE-1A – Ships operating in ice conditions of 0.8 m level ice thickness.

  • ICE-1A* – Ships operating in ice conditions with ice floes of 1.0 m level ice thickness.

  • ICE-1A*F – Ships operating regular services in ice conditions with ice floes of 1.0 m level ice thickness.

  • ICE-1B – Ships operating in ice conditions with ice floes of 0.6 m level ice thickness.

  • ICE-1C – Ships operating in ice conditions with ice floes of p.4 m level ice thickness.

  • ICE-C – Class notation for ships operating in light ice conditions.

  • ICE-E – Ships with ice strengthening for light localised drift ice in mouths of rivers and coastal areas.

  • PC1-PC7 - Ships designed for ice breaking year-round in polar waters.

• AP: Alternative propulsion
  An alternative propulsion system aims to enhance safety and increase flexibility. Safety: Alternative propulsion can save your vessel from grounding or enables it to reach a harbour in case of main propulsion failure. Flexibility: AP increases the possibilities for maintenance on main propulsion in harbours.

• CLEAN:
  The rules for this notation state requirements for design and equipment reducing the environmental impact from emissions to air, discharges to sea, and deliveries to shore from ships. The requirements are in compliance with or more extensive than those found in international standards currently in force. Ships complying with the requirements in this chapter may be given the additional class notations CLEAN or CLEAN DESIGN.