In an ongoing Joint Industry Project, DNV Classification Note 30.5: Environmental Conditions and Environmental Loads is being updated in accordance with the present state-of-the-art and corresponding industry needs and at the same time converted into a DNV Recommended Practice DNV-RP-C205. The updates include topics on non-linear wave diffraction around large volume structures, higherorder wave loading, slamming, run-up and wave in deck loads. The new RP also includes an improved description and statistical modeling of wind and ocean waves. Other new topics are shallow water waves and their load effects. New and updated guidance is provided on vortex induced vibrations in current and waves, and vortex induced motions of floaters. The new RP also has a chapter on model testing.