Go to the Insight Genesis website and set up a free account. From there you can upload you sonar log to the account. In a couple of hours, you will receive an email saying your log is ready to view. They have a sonar viewer that will show you everything you logged. It's a little tricky at first to do all of this. but in time you should get used to it. I do it on a PC, not a Mac, so I can't help you there. After you view it, you can generate your own map of what you logged , download it back to your SD card , put it into your Lowrance unit and use it. It's pretty cool.