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meant that it was easy to handle (e.g. keeping it warm just before deployment was simply done by placing inside the explorer’s jacket). The screen allowed an immediate return of temperature and salinity readings, which were successfully relayed back to London HQ on a regular basis. In the round, the Castaway provided an easy and useful back-up to the data returned by our main CTD." Maintenance of the Castaway is very simple; a quick rinse with fresh water and the occasional scrubbing of the corrosion-resistant electrodes is all that is required to keep the Castaway-CTD in shape between recommended annual factory calibrations.


Warm water application Recently, the Castaway-CTD was employed in a similar manner on


BBC 1’s Ocean Giants narrated by Stephen Fry. The first episode in a 3-part series investigated why Blue Whales, usually a migratory species, stay around the Sri Lankan coastline in the warmer waters. Marine biologist Asha de Vos wanted to study the features of this water that sustain these whales year round, using the Castaway to record salinity and temperature levels at differing depths she concluded: “Along our coastline, there are areas of mass upwelling of cold, nutrient rich water from the depths. These upwellings provide the perfect conditions for whale food; krill.”


Whilst Castaway retains all the advantages of a traditional CTD system, its additional appeal lies with its convenience, flexibility and speed – whether the instrument is being used in the freezing waters of the Arctic or the warm tropical waters of Sri Lanka.


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