Headway speed is not "slowest possible speed. While the overtaking vessel normally should yield right of way, if a slower vessel is intentionally impeding safe operation, that's a no-no too.
When I come upon a "super-slow" in the Weirs Channel, it's usually a passing signal on the horn and I maintain steerage. Most boats either speed up a little or move to the side, and we all wave to each other.
Whatever you do, always smile and wave. This is pleasure boating, after all.
Other choice: let the girl in the bikini drive. Whatever she does, just shrug your shoulders, then smile and wave. (I know, I know. No angry letters, ladies. Just smile and wave.)
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