I am new to using GPS. Going to purchase HDS 5 or HDS 7. If I am creating a trail and go to split screen sonar for a period , will my GPS continue to track me and show this when I return to that screen? would I be better off going with the HDS 7 with the larger screen and larger pixal count. Anybody have this unit? Do you like it? .... Thanks, you guys have all the answers.