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Parece que PBO va a hacer una test del ultrasónico:

For the readers information Practical Boat Owner in the UK Boat maintenance advice, sailing and motor boats, practical advice | Pbo has been running a test project throughout 2009 on 2 dinghies moored in Poole harbour, using 2 types of ultrasonic systems. The results are due to be published in the March 2010 issue out on 1 Feb 2010.