That sound pretty easy. Even though this unit is new, It still acts like the depth reading is off but the next time I am out, I am going to bring a tape measure. I have read that this a problem with them which really is a surprised about. Hummingbird themselves to be honest is of little help. I fish salt water so it is set for saltwater. I don't know how many on here use it for the same reason? If this doesn't work out, I may have to try another maker. has anybody used it for wrecks or reefs? how has it worked for you? Thanks