***apologies for cross-postings*** As part of the *2019 Underwater Sound Sources Webinar Series* <https://dosits.org/decision-makers/webinar-series/webinars-2019/>, the* Discovery of Sound in the Sea (DOSITS) <http://www.dosits.org/>* Team will host two additional webinars in *September and October 2019*. These *60-minute webinars* will focus on *commercial shipping, sonar, and echosounders *as underwater sound sources. Each webinar will provide an overview of the sound source, an update on current research efforts, and a review of noise mitigation measures. An extended period of facilitated discussion will also be included at the end of each webinar. Prior to each webinar, an outline of the presentation(s), with links to relevant background content on DOSITS, will be made available. *Participants are encouraged to review these outlines, as well as archived webinars on the potential effects of underwater sound on marine animals, before each sound source webinar.* All webinars will be recorded and archived on the DOSITS website (Decision Makers Webinars <https://dosits.org/decision-makers/webinar-series/>). The first webinar will be led by *Michelle Sanders (Transport Canada)* and will focus on *commercial vessel noise as an underwater sound source*. This webinar will take place at *12:00 pm EDT on Wednesday, September 18, 2019*. The second webinar will be led by *Frans-Peter Lam (TNO) and Kelly Benoit-Bird (Monterey Bay Aquarium Research Institute), *and will focus on *sonars and echosounders*, respectively. This webinar will take place at *12:00pm EDT on Thursday, October 10, 2019. * *Interested individuals must register in advance for each webinar.* To register please visit: https://dosits.org/decision-makers/webinar-series/webinars-2019/ To learn more about this webinar series or to view previous webinars, please visit the DOSITS webpage, Decision Makers Webinars <https://dosits.org/decision-makers/webinar-series/>. Associated webinars and their resources were conducted in 2018, and have been archived here <https://dosits.org/decision-makers/webinar-series/webinars-2018/>. Questions? Please contact Holly Morin at holly_morin@uri.edu.