SonarChart™ is good for boaters – and for their propellers!21 August 2014
Navionics president and founder, Giuseppe Carnevali, shares his own personal experience which demonstrates the very practical value that SonarChart™ brings to boaters.
"My boat is about 3 miles up Bass River, MA, about half of which is incorrectly charted by NOAA (because of obsolete surveys), and the other half is not even charted at all. Every year at the end of the season I had to get my dented propellers fixed. Last year, after doing the SonarChart™ of Bass River, for the first time in 15 years my propellers needed no fixing!! Does this mean that the SonarChart™ is always perfect? Of course not. The SonarChart™ starts from the NOAA chart, augmented with other high-quality survey data (where available) and with crowd-sourced sonar logs. The NOAA chart can be wrong because it is based on obsolete data, or simply because it has errors, and if no better data is available, the SonarChart™ is no better than the NOAA chart. My best advice is to do what I did to save my own propellers: take a sonar log of your tricky spot, send it to Navionics, and get the best SonarChart™ of your area. If you can do it from a kayak, going right over all the rocks, so much better. If you do not have a sonar on your kayak, with $150 you can get one as described in Ben’s blog: an investment well worth the peace of mind, let alone the possible damage saving. If you then go to unfamiliar waters, cross check multiple charts and cross check them with your radar and sonar – and don’t forget to upload the sonar log. The whole boating community will benefit from it and you will enjoy not only safer charts for yourself, but also the warm feeling of contributing to the safety of your fellow boaters."