The scope for additional class notations DPS and DYNPOS provides technical requirements for design, documentation, certification and testing of systems for dynamic positioning for all types of vessel. These rules do not include requirements or recommendations in regard to vessel operation or other characteristics.

Requirements additional to these rules may be imposed by the national authority with whom the vessel is registered and/or by the administration within whose territorial jurisdiction it is intended to operate. Where national legislative requirements exist, compliance with such regulations will also be necessary.

These rules do not give guidance on the suitability of the different intended technical system configurations, with respect to the vessels various industrial mission(s). Reference is given to the recommended practice: DNVGL-RP-E306 Dynamic positioning vessel design philosophy guidelines.

The requirements in these rules are additional to the rules for main class. In particular see the relevant sections of:

— Pt.4 Ch.1 Machinery systems, general

— Pt.4 Ch.2 Rotating machinery, general

— Pt.4 Ch.3 Rotating machinery - drivers

— Pt.4 Ch.4 Rotating machinery - power transmissions

— Pt.4 Ch.5 Rotating machinery - driven units

— Pt.4 Ch.8 Electrical installations

— Pt.4 Ch.9 Control and monitoring systems.

• The rules in this section apply to systems for dynamic positioning. These rules do not include requirements or recommendations in regard to the vessels operation or other characteristics.

Requirements, additional to these rules may be imposed by the national authority with whom the vessel is registered and/or by the administration within whose territorial jurisdiction it is intended to operate. Where national legislative requirements exist, compliance with such regulations will also be necessary.

Note that these rules do not give guidance on the suitability of the different intended technical system configurations with respect to the vessels various industrial mission(s). Reference is made to the Society's recommended practice: DNVGL-RP-E306 Dynamic positioning vessel design philosophy guidelines.

The requirements in these rules are additional to the rules for main class. In particular see the relevant sections of:

— Pt.4 Ch.1 Machinery systems, general

— Pt.4 Ch.2 Rotating machinery, general

— Pt.4 Ch.3 Rotating machinery - drivers

— Pt.4 Ch.4 Rotating machinery - power transmissions

— Pt.4 Ch.5 Rotating machinery - driven units

— Pt.4 Ch.8 Electrical installations

— Pt.4 Ch.9 Control and monitoring systems.

• The scope for additional class notations NAUT(OC) and NAUT(AW) adds a level of safety in reducing the risk of collision, grounding and heavy weather damage through enhancement of the reliability of the bridge system. The requirements in this section have been established on the supposition that the regulations of international conventions and the rules for main class have been complied with. Within the operational limits of the applicable class notation, these rules aim to safeguard that the officer of the navigational watch has full control of all the primary functions he/she is responsible for, including the look-out function required by COLREG 72, [single-handed]. Moreover, the rules acknowledge that the modes of operation and the manning of the bridge varies in accordance with internal and external conditions as, for example; availability of technical systems, types of water (ocean, coastal, open), traffic density and weather conditions. These rules therefore aim to provide a bridge arrangement suitable for an augmented bridge team, when required by operational or legislative conditions.

• The scope for additional class notation NAUT(NAV) is related to the ergonomic and technical design of the bridge. This notation has been developed to realize a successful ergonomic design of the bridge and the equipment on the bridge, which will improve the reliability and efficiency of navigation. Additionally, these rules contain ergonomic requirements as well as a functionally oriented bridge layout to support watch-keeping personnel in their tasks by a user-centered design of the bridge equipment and layout.

• The scope for additional class notation NAUT(OSV) adds an increased level of safety concerning bridge operations and safety of navigation related to: design of the bridge and the working environment, equipment performance and reliability, ergonomic principles and tests and trials. The rules in this section address the elements of the bridge system affecting the safety of navigation, both for the total bridge system, see Figure 1, and for those elements related to bridge system failure, see Figure 1.