A shot in the Dark. Have you updated the soft ware for your unit? http://www.lowrance.com/en/Products/Mar … re-Update/ You might also want to try a Soft Reset. LCX 18C Reset , 1. Turn unit OFF, , || 2. Press and hold the PAGES key, , || 3. Press and hold the PWR key, , || 4. Release both buttons when the USA map appears, || GlynnLast edited by NELA COUGAR on April 14th, 2009, 4:59 am, edited 2 times in total.