I push it then look at how far from home I am. It starts at 200 miles and decreases as I slowly drive the boat south. The Home button is not a navigational aid - it's intended for the home sick mariner. The Food Chain. Seals eat small fish, ducks eat small fish, eagles eat small fish, and big fish eat small fish.
Orcas eat fish and seals and eagles eat most other birds.
Suddenly, I very much appreciate being on the top of the food chain. I'm specially interested in how eagles and other birds interact. I sure would not choose to live here, there are eagles all over up here, I must see 20 or 30 a day. Yet many birds do live here and will fly right past eagles perched in a tree. Do the little birds not see the eagle or some how know the eagle had just eaten a fish and won't be hunting any more.