Sonic Vibration: What’s the frequency, Kenneth?
![Electronics](https://magarticles.magzter.com/articles/6171/214118/58d8f4ad43556/Electronics.jpg)
Keeping growth off our boats is a constant, unsatisfying battle. Growth rates of barnacles, mussels, and plant life change with water temperatures and seasons, bottom paint recipes change with environmental regulation, and the frequency at which we use our boats all impact how quickly ugly beards grow below the waterline. We employ a variety of methods to deal with growth, from having divers clean the hull, to costly haul-outs to remove growth and apply new bottom paint. In this never ending battle there is a tool that is often under-utilized: ultrasonic antifouling systems.
Ultrasonic antifouling is not a new concept. The United States Navy first discovered it in the 1950s during sonar testing with submarines. It was found that hull growth was far less substantial around the sonar tubes than on the rest of the hull. Further scientific and technological research has developed a number of products that utilize ultrasonic waves to control algae blooms in ponds and cleaning swimming pools.
This story is from the April 2017 edition of Passage Maker.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the April 2017 edition of Passage Maker.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
![Nord2AK: Nordhavn's 2016 Rendezvous](https://reseuro.magzter.com/100x125/articles/6171/192939/58370e18eaf23/crp_Nord2AK-Nordhavns-2016-Rendezvous.jpg)
Nord2AK: Nordhavn's 2016 Rendezvous
The seeds were planted in 2012. We had been cruising for several weeks in the remote waters of northern British Columbia, where it isn’t unusual to go for several days without seeing another boat. Then surprisingly, two other Nordhavns sailed into Sea Otter Cove where we were anchored on the west side of Vancouver Island.
![Cuban Sojourn](https://reseuro.magzter.com/100x125/articles/6171/192939/583711a02e1cc/crp_Cuban-Sojourn.jpg)
Cuban Sojourn
The second part of a journey along Cuba’s northern coast.
![Shop Talk](https://reseuro.magzter.com/100x125/articles/6171/237314/5991a5a491826/crp_Shop-Talk.jpg)
Shop Talk
Daniel Harper Q&A Founder & CEO of Siren Marine talks with us about how marine products are beginning to take advantage of onboard data.
![Bye, Bye, Birdie #5](https://reseuro.magzter.com/100x125/articles/6171/237314/5991ae714bcf1/crp_Bye-Bye-Birdie-5.jpg)
Bye, Bye, Birdie #5
The Need for Speed
![On The Water Duffield 58](https://reseuro.magzter.com/100x125/articles/6171/237314/5991aff6006c8/crp_On-the-Water-Duffield-58.jpg)
On The Water Duffield 58
It’s not every day that a brand-new 58-foot performance trawler appears on the marketplace radar, but that seems to have happened with the debut of the Duffield 58 Motoryacht.
![Castro's Mystery Motoryacht](https://reseuro.magzter.com/100x125/articles/6171/237314/5991b4433b09e/crp_Castros-Mystery-Motoryacht.jpg)
Castro's Mystery Motoryacht
Gianma and the voyage that changed the world.
![Bye, Bye, Birdie #6](https://reseuro.magzter.com/100x125/articles/6171/249334/59f8293b1c8d3/crp_Bye-Bye-Birdie-6.jpg)
Bye, Bye, Birdie #6
A Star to Steer Her By.
![Glass Living](https://reseuro.magzter.com/100x125/articles/6171/266897/5a96995e30392/crp_Glass-Living.jpg)
Glass Living
Testing the Modern and Versatile Okean 50.
![Navionics Spearheads Post-Irma Re-Mapping Effort](https://reseuro.magzter.com/100x125/articles/6171/266897/5a969b078868f/crp_Navionics-Spearheads-Post-Irma-Re-Mapping-Effort.jpg)
Navionics Spearheads Post-Irma Re-Mapping Effort
Boaters Can Contribute Cartography And Debris/Wreck Locations.
![Coping With Fog](https://reseuro.magzter.com/100x125/articles/6171/200591/586a56357c5cb/crp_Coping-With-Fog.jpg)
Coping With Fog
Dealing With One of the Most Dangerous Elements of Seamanship.