My Garmin went bad after 3 years. Water got inside the screen. I called the factory number and found they have flat price repairs.
My 168 sounder/GPS was 99 dollars no matter what happened to it. They gave me a return autho. number and charged my credit card. I had a new unit back within one week and Garmin took all my data and loaded it into the new one
Yep Garmin does have a flat rate. Sometimes on the older models they will offer to upgrade it for you if it is no longer in production, but it won't be for free. I had some warranty issues for a 240 blue and have nothing but good things to say about their service.