I believe this DVD was designed for those who are uninterested in reading the manual included with their Lowrance sonar/gps and unwilling to practice adjusting the settings on their own to experience how the unit functions. I expected to learn how to become a more proficient user, but found the instruction so basic, it was not helpful. The quality is satisfactory, but the depth of information provided is what most would call entry level. I would not recommend this unit for those who have already used Lowrance sonar/gps products.