I would say that a unit that is kept dry, is much more likely to outlast one that
sits outside in the humidity and/or takes trips out on the water in storms or in
rough spray.
I saw an episode of 'Ax men' where one boat was playing around and put their prop in the
water at an angle and drenched another boat. A Humminbird unit was on the drenched boat
and it was toasted. I don't think they ever did get it working again.
With any electronics, you can get a brand new one that craps out after one hour, or you could
have one last 10 years with no problems.
You would think that the more hours you have on a unit, the more chance that something will
burn out. That's just a guess, but it makes sense to me.
I would venture to say that because of the way the connectors are on Humminbird units, that
the units that stay bolted down without moving them, are in far better shape than the ones
that are removed and installed over and over. But unfortunately, because of security reasons,
some people must continually mount and unmount the units.
I'm sure that Humminbird keeps records of repairs and hours on the units.
If Greg could chime in with some into, then that would be great.
He would be the only one on this forum with access to actual hard data.