The three EquiMar engineering protocols were designed in conjunction with the International Energy Agency's Implementing Agreement on Ocean Energy Systems (IA-OES) 5 Stage development programme for wave energy converters (WECS). The objective is to complement that overview document by detailing the project planning and technical requirements necessary to safely and successfully advance the design of a WEC with minimum risk and uncertainty. This manual addresses Stages 3 and 4 and introduces guidelines for the testing, monitoring and evaluating of the sea trial of solo devices. The US Department of Energy's (DOE) Technology Readiness Assessment scheme for the development of marine hydrokinetic (MHK) devices also follows a similar format but with 9 Technology Readiness Levels (TRL).