Thanks to everyone who has replied. I value the varied responses. I wanted to get varied information and I did. Thanks to all.
BUT, I do have another question.
In reading on the lowrance Elite 5 dsi it says you can track back to view and mark waypoints. I know most of the finders have this feature now but, How far back? What dictates how far back you can go on the screen? Time, memory size, distance, or from the time you power it up for the day till you power it back down? Or can you go back to a complete different day and view it and mark waypoints on it?