This guideline is about making new rules for stopping ships that use azimuthing thrusters. The current SOLAS rules don't consider modern ship designs with different types of propulsion systems and technology improvements in ship equipment and design tools. These rules also don't consider how well azimuthing thrusters can stop a ship efficiently and safely.
The Guideline problematises proposed rule changes to SOLAS chapters II-1 and V to include both traditional and newer ship propulsion and steering systems and makes suggestions for regulatory improvements.
The complete guideline may be found here