Tridens left Scheveningen harbour on 23.06.2014 to head up north for the annual North Sea herring acoustic survey. The first week was dedicated to equipment calibration and the actual survey will take place over the following 3 weeks. Before departure, some shocking scenes were seen in Scheveningen however: the freezer trawler "Johanna Maria" was on fire! The emergency operations could be seen at very close distance.
Soon after, we were departing from Scheveningen, in rather nice weather conditions.
Arrival in Scapa Flow was on Tuesday night. The following couple of days were used for equipment calibration. For this, we need a sheltered location with 25-30m of water under the transducer of the echosounder.
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| Tridens at the calibration spot in Scapa Flow, Orkney Islands |
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| The towed body used as a platform to house the transducers is being prepared for calibration |
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| Dirk Burggraaf steering the tungsten carbide calibration spheres through the acoustic beams in order to calibrate the echosounder. |
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