I have a Lowrance 7 HDI @ the helm and among my issues with it is the GPS does not follow me. Like last trip I went to lake A and now when I go next to lake B 50 miles away. When I get to lake B and turn on my unit it's still gonna show me 50 miles away at lake A. Same issue on the lake...to follow myself on the lake I must manually move the cursor to keep up with my actual position. What do I need to do to make it track my current position????