I use the system out of water, the depth moves around, I believe that Greg has recommended not to do this.
I have done it for the past 2 years without a problem (so far), but when I do it I am setting up menu options for the next trip out.
I have an extra transducer, GPS puck and 110 conversion so that I can play with it in the house. Many times I am reading instruction on my computer and playing with the system at the same time. I have found this to be convenient when playing with the mapping programs.
George