took the H2Oc unit to marine repair center as suggested by mr babler. the results are as follows. the unit i have is only 3 years old. they no longer make them, or parts for repair. if you own one now and something goes wrong with it your just crap out of luck. just as i researced before posting its true. no help is available. some of my friends told me not to buy a lowrance product before i purchased it. it lasted 3 years so maybe $100 a year is a good lesson. am i upset you bet! mr babler i have nothing but total respect for you and i realize you have nothing to do with this problem, but when a company sells a product and doesnt service it, they are totally out of line! thank you for trying to help, thats more than lowrance has done. if you have another suggestion or can help with lowrance i would appreciate it.