Bought a Humminbird 597 at bass pro on Black Friday to go up front and it works fine but need to get the speed to show up on the screen and can't see any option for the speed on mine. I just watched the video of a 597 and his shows the option for the speed but mines not showing up. Some of the pics on the box shows the screen so I think it's there somewhere. Should I reset the whole unit and start from scratch? I've tried switching from beginner mode to advance mode but neither show the option. Any help is greatly appreciated. Thanks