I bought this thinking it would help me learn the functions of the HDS unit. It did not! All the video is is a guy going through the menu of the unit. I could have done that for free people... It did not explain any of the questions that I had for the unit. If you have never used a depth finder, you can learn a little from this. However, you can also learn the same thing by doing a search of how a depth sounder works. I honestly felt bad for selling this thing on ebay..
![Lowrance Hds 8 8m 10 10m Gps Chartplotter - Sonar [DVD] [Import]](https://m.media-amazon.com/images/I/714KNyhtgaL.__AC_SX300_SY300_QL70_ML2_.jpg)
