Not really answering your question.
A long while ago, I dropped my humminbird (it was old and saw a ton of use) onto a cellar floor and cracked the screen. I loved that unit and called customer service. The guy I spoke with highly recommending throwing my ff away and buy a new one. He indicated that for what I was going to pay to get it fixed, a new one would be light years ahead. I bought a Garmin.
Two years ago, my son bought a portable. In a short period of time, the bag ripped. I called CS and told them what happened, expecting to buy a new bag. Without any question, we had a free new bag in a few days.
In short, my two experiences with Humminbird Customer Service over the last 15 years has been positive.