"Eisboch" wrote:
Unless ... he has a leaking add-on below the waterline .... depth finder
head ... speedometer paddle wheel ... or a crack in the hull someplace.


Wayne.B wrote:
Or unless it can leak in from above with rain water, spray, etc.


That would be my first suspect, but it'd definitely be worth
while to make a serious hunt for those other problems too. A
crack in the hull might produce noticable noise & flexing
when underway, but then again it might not.

Rain is a very seriouos culprit for trailerable boats....
also sinks more in-water boats than anything else.

DSK