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Characterizing Interactions Among Uses Ocean uses co-occur commonly in U.S. waters. The potential outcomes of these interactions, which may be mitigated by spatial and/or temporal activities management, tend to fall along a gradient from confict (negative) to compatibility (positive).1 Confict: when two uses co-occur with adverse impacts to one or both. ➪ ➪ Pre-emption — the long-term introduction of facilities, structures, or activities that physically preclude other uses from being pursued in that space (e.g., oil rigs vs. commercial shipping). Interference — adverse interactions among transient ocean uses that may create risks or otherwise diminish the successful pursuit of one or more uses (surfng vs. wave energy capture devices). ➪ Indirect conflict — impairing the successful pursuit of one use through the impacts of another use on ecosystem features and services it requires, whether or not they cooccur at the same space and time (e.g., nature photography using SCUBA diving vs. fshing with benthic mobile gear). Compatibility: when two uses co-occur without adverse impacts to either. ➪ ➪ Neutral — each use has a negligible impact on the other (underwater transmission cables vs. kayak paddling). Synergy — one or both uses may beneft from the presence of the other, such as wind turbine and aquaculture. Endnote: 1. Defnitions derived from concepts developed as part of the NOC CMSP Guidance Interagency Science Needs Team. Ocean Use Categories SCUBA / Snorkeling Cultural Use Hunting Military Vessels Swimming Pelagic Fishing Wind Energy Mining and Mineral Extraction Surface Board Sports Fishing with Benthic Mobile Gear Wave Energy Offshore Aquaculture Paddling Fishing with Benthic Fixed Gear Ocean Current Energy Coastal Aquaculture Sailing Kayak Fishing Tidal Current Energy Seawater Intake Motorized Boating Dive Fishing Ocean Thermal Energy Conversion Sewage Discharge Wildlife Viewing at Sea Fishing from Shore Offshore Oil and Gas Energy Ocean Dumping Tide Pooling Gathering from Shore Commercial Shipping Underwater Transmission Cables Shore Use Offshore Seaweed Harvest Cruise Ships The Common Language of Ocean Uses, showing 35 common Use Categories. Graphic information courtesy of: NOAA's Marine Protected Areas Center. 72 Proceedings Fall 2013 www.uscg.mil/proceedings