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| http://www.thalespons.com/en/underwater-positioning/naiad/naiad-5.html | ||||
| The system is not new, but keeps interesting! It is for underwateruse. | ||||
| There was also a system that works for surface searching: | ||||
| The ENOS system | ||||
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| http://www.seareq.de/de/index.htm | ||||
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