A baseline is required to be established to help with determining the environmental impacts of proposed marine renewables developments in the Orkney area. Firstly, a detailed literature review of cetacean and basking shark records for Orkney waters is required. This should include all records out to 12nm and may include information obtained outwith this limit(eg SEA for wave and tide, SEA for offshore developments, SCANs) for context. The area covered should include North Ronaldsay in the north to the Caithness coast in the south and should include the Pentland Firth from Cape Wrath to Wick. The review should outline what type of data is available (eg abundance, distribution, behaviour, size of group) and identify any gaps in knowledge (eg species, seasonal, locational, behaviour). The second part of this contract should develop a brief outline of a likely monitoring programme that will be required to establish a suitable baseline of cetacean and basking shark usage of Orkney waters and fill any gaps identified in part one. The outline should look at different scales of monitoring area: 1) site specific survey of areas already identified as preferred locations for marine renewables; 2) The coastal fringe of Orkney/Pentland Firth out to 3nm; 3)The entire extent of Orkney waters out to 12nm as detailed above. The monitoring outline should include a variety of different monitoring techniques (eg aerial, boat based, PAMs). It should assess the feasibility, practicality, limitation and likely cost of each of the options for achieving baseline monitoring at each of the scales suggested (bearing in mind the georgraphic location and extreme weather conditions that may be encountered). The outline monitoring programme should be designed for 1, 2, 3 and 5 years of monitoring and include details of any changes to monitoring effort or techniques required in separate years (if any).