I have tried many times without success to find out who is supplying Costco with it's gasoline. In our area it is delivered by an independant fuel delivery service so unless you followed the truck you would not know where it is comming and going to. The supplier could also change from time to time based on bidding.
Oceans around the world are becoming degraded. Evidence shows that human activities, including intense fishing around the world, are altering ocean ecosystems beyond their natural state. According to numerous scientific studies, fish, shellfish, and other important species are declining in many places.
Even though the transducer may alarm fish every now and then, keeping it on is a lot more useful in the long run than keeping it off! In the water, other boats cause noise, bait fish make noise, grass that grows through the surface makes noise, and if a bass attacks some forage, it makes noise!