Join Date: Apr 2006
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Bill, a head which is mounted athwartship is mounted so you are facing either the bow or the stern, not the side of the boat, when you are on it.
The advantage is that it is equally easy to use on either tack, and some folks consider a head moutned athwartship to be a sign of a designer who spent some time getting things right.
"the head centerline is parallel to the cabinet side." that sounds like a proper installation, athwartship.
Most heads are kinda jammed in whichever in order to make 'em fit, so whatever works for you, works for you.