>>Maritime Terms website definition is ambiguous; therefore, unreliable as a source of information. <<
Don't know about that, Duke. I thought that
"The act of striking or collision of a moving vessel against a stationary object". was clear cut and to the point. Perhaps
unsatisfactory since it can be a simplistic term to describe a very complex event or sequence of events, but hardly unreliable. For our purposes, it works, so I won't split hairs.
But if you want to, have fun with it. It's a minor point in this context so I won't quibble.
>>But is a drifting iceberg considered a fixed object? <<
I think that for all practical purposes, it can be. While the berg was in motion with the current, it wasn't exactly moving at warp speed.