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Cefas currently uses hand deployable multi-parameter sondes (CTDs) for collecting water column data. With the advent of easy-to-use small AUVs we wish to supplement these programs with more autonomous data collection. We envision a platform which will collect data comparable with our current instruments, which can also operate fully autonomously for a period of hours while our staff conduct other activities. 3. Technical Requirement Cefas require one small autonomous underwater vehicle equipped with biogeochemical sensors to supplement our water quality monitoring efforts. 3.1 The vehicle will be capable of collecting marine biogeochemical observations to a depth of 250 m. 3.2 It will weigh no more than 20 kg in air and will be deployable by a single person by hand, from shore or small vessels. 3.3 It will be fitted with sensors meeting the following specifications. 3.3.1 Temperature: Range: 0°C to 35°C Initial accuracy: ±0.01° Resolution: 0.0005°C Time constant: ~1s Typical stability: < 0.002°C per year 3.3.2 Conductivity Range: 0–85 mS/cm Initial accuracy: ±0.003 mS/cm Resolution: 0.001 mS/cm Typical stability: < 0.02 mS/cm per year 3.3.3 Oxygen concentration Range: 0–500 µM Init
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