This was posted by jonc on the locked donut thread:
"I looked at the video several times. If i'm not mistaking the lowrance shows the arrow forward.. but shows tracks going the opposite direction. Real nice."

jonc, the other lines you saw on the Eagle (not Lowrance ) screen were just pre-existing tracks, that video was shot in the mouth of a creek that the boat had already been over a couple of times that day. There was a straight line during the filming on all 4 of the units shown and also accurate directional arrows on 3 of them, I know that because I was doing the filming. Watch it again and you will see.http://www.youtube.com/watch?v=4C3O93OBpJE

Also, welcome to the forum.