Struggling to get your sonar settings correct? Look no further than the Sonar Settings Documents by Mason's Sonar Services! 
I go on hundreds of on the water training sonar trips a year and these are the exact settings I use to produce the clearest images out of these units.
What settings you receive:
Side imaging 
Down imaging 
2d sonar
Information on proper install and transducer placement
Once you purchase the document for your sonar/transducer you will receive an email with a link to access the settings document. You can download it from there.