I tried different courses in the past, but I could't get my head around it. (I'm an engineer, suffering a functional neurological disorder). Your course, with the narrations and videos is way better. There were a few issues with the course though: two YouTube videos that wouldn't play for me. In one chapter (forgot which one) I had to wait for 1.5 minute after the video ended to be able to get to the next chapter. I got lost in the chapter (6) about the navigations buoys. I used Google to make a few things clear. At the end I passes the exam. Thank you for making this possible for me.