Press and release to adjust the backlight and day/night modes. SRANGE(+/-) —press to adjust the range of the sonar. CROCKER—press up, down, left, or right to move through menus, highlight fields, and enter data. highlighted items and confirm on-screen messages. SMENU—press to view additional settings and configuration options; press to return to the previous screen when indicated. May 2007 Part Number 190-00757-01 Rev. A Printed in Taiwan Fishfinder 400C quick reference guide Understandi