Soretoe
Did not think you were, I always appreciate your comments.
My thoughts are that the water movements effects how the fish move in and out of shallow water. When I light up my unit I look at the altitude and try to remember it from the last trips. I am going to start writing it down. We also have a few unmarked areas (like most waters) that are dangerous and easy to run aground. If the altitude could be set at Zero, then when we are 16 feet low, it would create a quick visual of conditions.
Like I said it is just a thought to make it easier to visualize.
George