I have a Globalmap 2000 with both GPS and Sonar. The unit itself is properly a good 10 years old now but it has worked so well over the years I haven’t seen the need to replace it. Today I started the boat and powered on the LMS 2000 and hit the Sonar button and a message came on stating the following: "Sonar Not Selected". I looked in the manual and there is nothing related to this message, I then called Lowrance and was put in touch with a help desk person who had no clue what the problem was and or the English language. I tried doing the Factory Reset for the Sonar unit and didn't help either. Is there anyone out there with some information that I could use?