Lowrance 5 year upgrade program, if you have an older faulty non warranty unit around and it's no older than 5 years since manufacture/purchase. You can get half off a brand new up to date unit by calling Navico. I just did with an old non working Elite 5 unit. They even allowed me to choose the Elite-7 TI w/ HDI transducer. $325, 6 month warranty, purchased another 3 years for $96. No receipt necessary, have to send in the old head unit. They have you pay and choose a new model on your initial call/claim. SweeT DEAL, thanks Navico.
http://www.lowrance.com/en-US/Support/service-support/